The mainline AUS-LAX runs nearly the entire month of April, not just the single day you noted:
Code:
flight | orig | dest | equip | departs | from | to | days
--------+------+------+-------+----------+------------+------------+---------
UA370 | AUS | LAX | 739 | 06:03:00 | 2016-01-04 | 2016-01-04 | M
UA306 | AUS | LAX | 320 | 19:28:00 | 2016-03-03 | 2016-04-04 | M R
UA306 | AUS | LAX | 320 | 19:34:00 | 2016-03-04 | 2016-04-01 | F
UA256 | AUS | LAX | 738 | 14:15:00 | 2016-03-06 | 2016-04-03 | U
UA306 | AUS | LAX | 739 | 19:39:00 | 2016-03-08 | 2016-03-08 | T
UA306 | AUS | LAX | 320 | 19:38:00 | 2016-03-09 | 2016-03-09 | W
UA306 | AUS | LAX | 738 | 19:34:00 | 2016-03-15 | 2016-03-22 | T
UA306 | AUS | LAX | 739 | 19:38:00 | 2016-03-16 | 2016-03-30 | W
UA306 | AUS | LAX | 739 | 19:39:00 | 2016-03-29 | 2016-03-29 | T
UA305 | AUS | LAX | 739 | 16:39:00 | 2016-04-05 | 2016-05-04 | MTWRF U