STL- I think it's "mainline express."
US Airways loves it's divisions and subsidiaries. Ground handling could be done by Mainline, Mainline Express (mainline but express contracts), MidAtlantic (a division of the mainline handling only the E170s, which is the crew version of mainline express- mainline folks, express contracts), PSA (a subsidiary), Piedmont (a different subsidiary; a third subsidiary- Allegheny; was just recently absorbed into Piedmont) or it could be contracted. US keeps each of these customer service and ramp groups seperate with different contracts. Really.
US Airways likes to keep things as complicated, redundant, and bizarre as possible. Next ask how many Express carriers there are or how many different fleet types US operated four years ago if you want to hear more nonsense.
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