I will be switching over to UA after Delta cut back on their schedule on BOS-DCA.
The UA BOS-DCA is via the US Air Shuttle code share, couple of questions:
1) Seat Assignment - can you reserve your seat after purchasing the ticket on UA website, or do you have to wait until 24 hours before departure to rserve your seat at the US Air website?
2) Can you check in at the UA website or do you have to check-in on US Air website?
3) Does US Air board UA Premier Executive first since it is a code share with UA before general boarding?

Thanks.