Hi, JeffSheets and welcome to FlightAware. Perhaps what you’re seeing is the result of a seasonal wind change? Here’s the departure time (Zulu), airspeed, and filed enroute time for the last couple months.
2005-10-01 16:25:00 | 469 | 09:10:00
2005-10-02 16:26:00 | 474 | 08:58:00
2005-10-03 16:28:00 | 472 | 08:59:00
2005-10-04 16:18:00 | 471 | 08:59:00
2005-10-05 16:22:00 | 473 | 09:02:00
2005-10-06 19:36:00 | 475 | 08:53:00
2005-10-07 16:33:00 | 472 | 08:50:00
2005-10-08 16:35:00 | 469 | 08:55:00
2005-10-09 16:21:00 | 469 | 09:06:00
2005-10-13 16:22:00 | 474 | 08:52:00
2005-10-11 16:20:00 | 475 | 08:53:00
2005-10-12 16:23:00 | 475 | 08:54:00
2005-10-10 16:27:00 | 480 | 09:01:00
2005-10-14 16:27:00 | 479 | 08:55:00
2005-10-16 16:27:00 | 478 | 09:04:00
2005-10-15 16:27:00 | 480 | 09:10:00
2005-10-17 16:21:00 | 474 | 09:06:00
2005-10-18 16:26:00 | 468 | 08:59:00
2005-10-20 16:27:00 | 479 | 09:19:00
2005-10-21 16:25:00 | 478 | 09:11:00
2005-10-22 16:22:00 | 478 | 09:18:00
2005-10-23 16:23:00 | 482 | 09:13:00
2005-10-24 16:22:00 | 482 | 09:04:00
2005-10-25 16:21:00 | 477 | 09:18:00
2005-10-26 16:28:00 | 477 | 09:15:00
2005-10-27 16:28:00 | 474 | 09:12:00
2005-10-28 16:51:00 | 466 | 09:14:00
2005-10-29 16:19:00 | 465 | 09:17:00
2005-10-30 17:29:00 | 471 | 09:17:00
2005-10-31 17:22:00 | 471 | 09:17:00
2005-11-01 17:32:00 | 470 | 09:11:00
2005-11-02 17:28:00 | 468 | 08:58:00
2005-11-03 17:22:00 | 469 | 08:57:00
2005-11-04 17:19:00 | 479 | 09:28:00
2005-11-05 17:44:00 | 480 | 09:21:00
2005-11-06 17:26:00 | 480 | 09:26:00
2005-11-07 17:22:00 | 469 | 09:19:00
2005-11-08 17:22:00 | 477 | 09:06:00
2005-11-09 17:19:00 | 478 | 09:06:00
2005-11-10 17:29:00 | 475 | 09:06:00
2005-11-11 17:19:00 | 470 | 09:04:00
2005-11-12 17:18:00 | 477 | 08:59:00
2005-11-13 17:22:00 | 477 | 09:07:00
2005-11-14 17:22:00 | 476 | 09:06:00
2005-11-15 17:32:00 | 476 | 09:17:00
2005-11-16 17:23:00 | 482 | 09:06:00
2005-11-17 17:24:00 | 479 | 09:13:00
2005-11-18 17:24:00 | 480 | 09:02:00
2005-11-19 17:22:00 | 475 | 09:06:00
2005-11-20 17:19:00 | 476 | 09:00:00
2005-11-21 17:15:00 | 465 | 08:58:00
2005-11-22 17:31:00 | 474 | 09:12:00
2005-11-23 17:21:00 | 475 | 09:14:00
2005-11-24 17:26:00 | 477 | 09:19:00
2005-11-26 17:19:00 | 473 | 09:32:00
2005-11-25 17:21:00 | 481 | 09:23:00
2005-11-27 17:19:00 | 479 | 09:31:00
2005-11-28 17:24:00 | 479 | 09:35:00
2005-11-29 18:11:00 | 469 | 09:37:00
2005-11-30 17:19:00 | 467 | 09:36:00
2005-12-01 17:22:00 | 484 | 09:49:00
2005-12-02 18:29:00 | 468 | 09:51:00
2005-12-03 17:27:00 | 465 | 09:49:00
2005-12-04 17:32:00 | 482 | 09:40:00
2005-12-05 17:33:00 | 477 | 09:36:00
2005-12-06 17:19:00 | 478 | 09:48:00
2005-12-07 17:25:00 | 484 | 09:16:00
2005-12-08 17:30:00 | 468 | 09:01:00
2005-12-09 17:36:00 | 478 | 08:46:00
2005-12-10 17:18:00 | 472 | 09:13:00
2005-12-11 17:38:00 | 471 | 09:14:00
2005-12-13 17:21:00 | 478 | 09:24:00
2005-12-12 17:22:00 | 471 | 09:38:00
2005-12-14 17:23:00 | 481 | 09:17:00
2005-12-15 17:49:00 | 459 | 09:31:00
2005-12-16 17:23:00 | 485 | 09:38:00
2005-12-17 18:29:00 | 483 | 09:46:00
2005-12-18 17:22:00 | 483 | 09:55:00
2005-12-19 17:20:00 | 481 | 09:47:00
2005-12-20 17:48:00 | 467 | 09:24:00
2005-12-21 17:52:00 | 460 | 09:13:00
2005-12-22 17:27:00 | 459 | 09:14:00
2005-12-23 17:30:00 | 462 | 09:25:00
2005-12-24 17:18:00 | 471 | 09:05:00
2005-12-25 17:28:00 | 465 | 09:19:00
2005-12-26 17:24:00 | 474 | 09:21:00
2005-12-27 17:22:00 | 470 | 09:21:00
2005-12-28 17:27:00 | 467 | 09:20:00
2005-12-29 17:26:00 | 479 | 09:10:00
2005-12-30 17:24:00 | 480 | 09:13:00
2005-12-31 17:21:00 | 479 | 09:19:00
2006-01-01 17:16:00 | 481 | 09:37:00
2006-01-02 20:02:00 | 473 | 09:48:00
2006-01-03 17:58:00 | 484 | 09:41:00