| LAST SEEN 19 MINUTES AGO |
 |  |
Departure (DL1421 Flight Schedule)
Los Angeles, United StatesPST 00:00:00 DAY
Arrival (DL1421 Flight Schedule)
PST 00:00:00 DAY
Flight Radar Checker DL 1421
Live Flight Tracker Map
Flight DL1421 from Los Angeles to San Francisco is operated by Delta Air Lines. Scheduled time of departure from Los Angeles Intl is 06:00 PST and scheduled time of arrival in San Francisco Intl is 07:30 PST. The duration of the flight is 1 hour 30 minutes.
Flight Finder
from San Francisco to Los Angeles
| Flight | Departure | Arrival |
|---|---|---|
| UA8109 00:21 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA2179 00:30 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| DL1598 07:31 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA1571 07:35 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA1946 07:36 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS3318 07:37 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| EJA190 07:39 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN1916 07:55 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AA2211 08:45 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN572 08:55 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA1260 08:59 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA2113 09:00 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN188 09:00 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS1329 09:18 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| F93308 09:40 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| DL1421 10:00 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| OO250 10:13 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA1896 10:43 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS2493 10:44 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS3250 10:50 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| EJA906 11:04 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AA6381 11:55 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| DL1715 12:10 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN2553 12:15 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| OO6316 12:16 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA1164 12:27 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS2061 12:41 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AA6316 12:47 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS2292 13:13 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA5619 13:38 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| DL2272 13:56 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN1741 14:10 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA1498 14:56 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS2079 15:17 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN1348 16:40 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS2008 16:44 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AA6324 17:02 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| DL2267 17:03 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS3496 17:08 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA1754 17:43 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| EJA334 18:06 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN4306 18:20 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN537 18:30 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA1364 18:31 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| VJA504 18:36 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN1306 18:45 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS2481 18:53 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA2860 19:16 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS2096 19:37 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| DL1167 20:14 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS3382 20:15 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA1800 20:26 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AA6371 20:29 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN4307 20:45 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN3421 21:05 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS2474 21:06 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA3903 21:21 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN1549 22:00 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS3353 22:08 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| F92858 22:20 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA5459 22:24 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| DL1554 22:50 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| UA564 22:52 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| WN3532 23:05 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS3013 23:36 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
| AS2496 23:51 |
San Francisco Intl (SFO) |
Los Angeles Intl (LAX) |
History Flight Information for DL1421 from Flight Scanner System
| Date | Flight | Departure Airport | Arrival Airport | Scheduled | Plane | Estimated | ||
|---|---|---|---|---|---|---|---|---|
| Departure | Arrival | Departure | Arrival | |||||
| Sun, 14 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | |||
| Sun, 14 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3737C (Boeing B738) | 05:54 PST | 05:54 PST |
| Sat, 13 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | |||
| Fri, 12 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | |||
| Fri, 12 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3761R (BOEING B738) | 05:52 PST | 09:23 PST |
| Thu, 11 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | N3742C (Boeing B738) | 09:55 PST | 09:55 PST |
| Thu, 11 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3742C (Boeing B738) | 05:53 PST | 09:24 PST |
| Wed, 10 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | |||
| Wed, 10 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3768 (Boeing B738) | 05:58 PST | 09:23 PST |
| Tue, 09 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | |||
| Tue, 09 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3768 (Boeing B738) | 05:54 PST | 09:27 PST |
| Mon, 08 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | N3744F (Boeing B738) | 08:50 PST | 09:43 PST |
| Mon, 08 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3744F (Boeing B738) | 06:31 PST | 07:34 PST |
| Sun, 07 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3744F (Boeing B738) | 07:38 PST | 09:23 PST |
| Sat, 06 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | |||
| Sat, 06 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N776DE ( B738) | 05:53 PST | 09:29 PST |
| Fri, 05 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | |||
| Fri, 05 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | |||
| Thu, 04 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | 08:39 PST | 09:33 PST | |
| Thu, 04 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | 05:52 PST | 07:17 PST | |
| Wed, 03 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | |||
| Wed, 03 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N383DN (Boeing B738) | 06:04 PST | 09:18 PST |
| Tue, 02 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 09:59 PST | |||
| Tue, 02 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3769L (Boeing B738) | 05:55 PST | 09:19 PST |
| Mon, 01 Dec | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | N391DA (Boeing B738) | 08:53 PST | 09:45 PST |
| Mon, 01 Dec | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N391DA (Boeing B738) | 05:58 PST | 07:28 PST |
| Sun, 30 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Sun, 30 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N373DA (Boeing B738) | 05:15 PST | 09:33 PST |
| Sat, 29 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | N338DN ( A321) | 08:50 PST | 09:40 PST |
| Sat, 29 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3769L (Boeing B738) | 05:54 PST | 09:35 PST |
| Thu, 27 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Thu, 27 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3757D (Boeing B738) | 05:54 PST | 09:27 PST |
| Wed, 26 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Wed, 26 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3768 (Boeing B738) | 05:50 PST | 09:26 PST |
| Tue, 25 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Tue, 25 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3732J (Boeing B738) | 05:55 PST | 09:22 PST |
| Mon, 24 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | N3768 (Boeing B738) | 08:37 PST | 09:27 PST |
| Mon, 24 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3768 (Boeing B738) | 05:55 PST | 06:55 PST |
| Sun, 23 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | N376DA (Boeing B738) | 08:42 PST | 09:35 PST |
| Sun, 23 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N376DA (Boeing B738) | 05:51 PST | 07:01 PST |
| Sat, 22 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Sat, 22 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N371DA (Boeing B738) | 05:49 PST | 09:35 PST |
| Fri, 21 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Fri, 21 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3733Z (BOEING B738) | 06:00 PST | 09:33 PST |
| Thu, 20 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | N3767 (Boeing B738) | 09:37 PST | 10:50 PST |
| Thu, 20 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3767 (Boeing B738) | 05:57 PST | 08:17 PST |
| Wed, 19 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Wed, 19 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3731T (Boeing B738) | 05:55 PST | 09:13 PST |
| Tue, 18 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Tue, 18 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3749D (Boeing B738) | 05:55 PST | 09:29 PST |
| Mon, 17 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | N393DA (Boeing B738) | 08:54 PST | 09:47 PST |
| Mon, 17 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N393DA (Boeing B738) | 05:52 PST | 08:15 PST |
| Sun, 16 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Sun, 16 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3766 (Boeing B738) | 06:00 PST | 09:36 PST |
| Sat, 15 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | N3742C (Boeing B738) | 08:56 PST | 10:17 PST |
| Sat, 15 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3742C (Boeing B738) | 05:57 PST | 08:03 PST |
| Fri, 14 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | N3732J (Boeing B738) | 08:41 PST | 09:43 PST |
| Fri, 14 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3732J (Boeing B738) | 05:54 PST | 07:04 PST |
| Thu, 13 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Thu, 13 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3766 (Boeing B738) | 05:50 PST | 07:21 PST |
| Wed, 12 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Wed, 12 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3749D (Boeing B738) | 05:53 PST | 09:33 PST |
| Tue, 11 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Tue, 11 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3773D (Boeing B738) | 05:55 PST | 09:26 PST |
| Mon, 10 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Mon, 10 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N3731T (Boeing B738) | 05:51 PST | 06:53 PST |
| Sun, 09 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:25 PST | 10:00 PST | |||
| Sun, 09 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:30 PST | N390DA (BOEING B738) | 05:52 PST | 09:36 PST |
| Sat, 08 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:20 PST | 09:55 PST | |||
| Sat, 08 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:25 PST | N3766 (Boeing B738) | 06:09 PST | 09:15 PST |
| Fri, 07 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:20 PST | 09:55 PST | N381DN (Boeing B738) | 09:06 PST | 10:04 PST |
| Fri, 07 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:25 PST | |||
| Thu, 06 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:20 PST | 09:55 PST | |||
| Thu, 06 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:25 PST | N3754A (Boeing B738) | 06:08 PST | 09:37 PST |
| Wed, 05 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:20 PST | 09:55 PST | N396DA (Boeing B738) | 08:56 PST | 09:47 PST |
| Wed, 05 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:25 PST | N396DA (Boeing B738) | 05:54 PST | 08:23 PST |
| Tue, 04 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:20 PST | 09:55 PST | |||
| Tue, 04 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:25 PST | N396DA (Boeing B738) | 05:46 PST | 09:25 PST |
| Mon, 03 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:20 PST | 09:55 PST | N3763D (Boeing B738) | 08:29 PST | 09:22 PST |
| Mon, 03 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 06:00 PST | 07:25 PST | N3763D (Boeing B738) | 06:12 PST | 07:23 PST |
| Sun, 02 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 09:20 PST | 10:55 PST | N3771K (Boeing B738) | 11:42 PST | 11:42 PST |
| Sun, 02 Nov | DL1421 | Los Angeles Intl (LAX) | San Francisco Intl (SFO) | 07:00 PST | 08:25 PST | N3771K (Boeing B738) | 07:11 PST | 09:41 PST |
| Sat, 01 Nov | DL1421 | San Francisco Intl (SFO) | Los Angeles Intl (LAX) | 08:20 PDT | 09:55 PDT | N775DE ( B738) | 07:58 PDT | 08:53 PDT |
Disclaimer for DL1421 Flight Radar Data
Flight DL1421 from Los Angeles Intl to San Francisco Intl data is collected from different sources. The data is for informational purposes only and PlaneMapper is not responsible for the accuracy and reliability of flight DL1421 data.
