This airline is horrible. I made a trip to Mexico and was charged 25 usd for 1 bag. The airline staff told me that only "international flights" were not charged this fee and that mine WASN'T international because you have to travel "through oceans". WTF
I asked them if I woud had to pay the fee if travelled to Patagonia, Argentina. I got the same lame response. For US Airways every flight is "domestic" within the hemisphere.