It's not just seasonal winds. They drop the block time from 5:55 to 5:46 in mid August, and then increase it to 6:25 Dec 3 through Dec 18, before dropping it back to 5:46 through EOS.
Code:
flight | orig | dest | eqp | departs | block | from | to | days
--------+------+------+-----+----------+-------+------------+------------+---------
UA2679 | EWR | LAX | 752 | 09:55:00 | 5:55 | 2024-06-18 | 2024-06-26 | TWRFS
UA2679 | EWR | LAX | 752 | 09:55:00 | 5:55 | 2024-06-24 | 2024-06-29 | M RFS
UA2679 | EWR | LAX | 752 | 09:55:00 | 5:55 | 2024-07-01 | 2024-08-17 | MTWRFS
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2024-08-19 | 2024-09-23 | M R
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2024-08-20 | 2024-09-25 | TW FS
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2024-09-26 | 2024-10-26 | MTWRFS
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2024-10-27 | 2024-10-27 | U
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2024-10-28 | 2024-11-02 | MTWRFS
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2024-11-03 | 2024-12-02 | MTWRF U
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2024-11-09 | 2024-11-30 | S
UA2679 | EWR | LAX | 752 | 10:00:00 | 6:25 | 2024-12-03 | 2024-12-18 | MTWRF U
UA2679 | EWR | LAX | 752 | 10:00:00 | 6:25 | 2024-12-07 | 2024-12-14 | S
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2024-12-19 | 2024-12-22 | RFSU
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2024-12-23 | 2025-03-08 | MTWRFSU
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2025-03-09 | 2025-06-22 | U
UA2679 | EWR | LAX | 752 | 10:00:00 | 5:46 | 2025-03-10 | 2025-06-21 | MTWRFS