have used us airways twice,once to las vegas,connection in philly & once,when we travelled round,first flight was to new orleans,again the connection was in philly,then we picked another flight up,in atlanta,to fly to tampa,with a connection in charlotte,all in all,every flight was on time,all the connections went smoothly,apart from the connection to las vegas,where the time was very tight,fortunately,we weren't the only ones,they were waiting for,so they held the plane for us,it was very close.
we would use them again,i think the seat pitch was 33in,which makes a difference.
united,is my favourite airline though,we flew to hawaii & florida,with them in,in 06,because the seats are wider,than US,i found it to be a really comfortable flight.we are travelling with them,again this year.
you won't have any problems with US & i think flying scheduled,instead of charter,gives you less chance of delays.
tracy