They pad the schedule out of PHL pretty much. Since when does it take 5 Hrs 50 min. to Fly to LAS. If they happen to leave on time they just fly slower then to land near ontime, while the US flight that departs at the same time is already there in LAS for over 45 minutes already. I see flights that go to the same place, a WN flight to LAX took off at 7:15pm and a UA plane going to LAX took off at 7:35pm. The UA plane arrived in LAX about 15-20 minutes before the WN jet. I always like traveling East anyway.