Originally Posted by
CMK10
US has significantly cut down on their number of flights between LAX and PHX. In the HP and just after the merger days I think it was between 8 and 10 flights a day including a ~9:30 PM flight and a ~7 PM flight. Sadly, UA has cut down on their number of flights on this route too from their peak of 6 in the mid-2000s. WN seems to be the way to go for frequency
It looks like US continues the 9:30 PM flight when it has a sizeable bank of flights out of PHX - the "PHX flex".
In July, the flex operates a lot of the month and US has 7 flights a day including the 9:30 PM. In September, where the flex hardly operates, US mostly has 6 flights per day with the 5:50 PM being the latest.
From their perspective it makes sense, if you don't carry a large % of the local traffic (and WN will always be the preferred PHX local carrier), then there's no sense having a flight that doesn't connect to much.