I calculated some load factors for some carriers at PDX to see how they were doing. I however did not do ones that had many different types of aircraft coming in as they could have changed. Here is my list:
F9 90% (Based on one daily flight being an A318)
WN 79% (Based on all flights being 137 seats)
AA 94% (AA.com says MD-80's have 131 seats)
LH 93% (Based on the A343 having no FC leaving 266 seats)
It looks like the carriers are doing very well as long as the fares are good. Please feel free to correct me if my calculations seem to be off.