Actually the flight US801 on that day (Aug/21) was cancelled, the crew members were at the hotel lobby when
one of the F/A said she was not feeling well and then began vomiting and they agreed not to take the bus to the airport, got the keys to their rooms back and they worked flight 9010 that left GIG next morning at 1057 and arrived CLT at 2030.
AstroLounge is right, you can verify it via Catcrew but you need to use Aug/22 instead of Aug/21 for flight 801.
Different treatment was given by Delta Airlines to their employees. After evaluating the situation the airline decided to cancel the flight to ATL and deadheaded them to their final destination as most of the crew members, if not all, were commuters.
That is what US Airways should have done. The shooting started at about 7:20AM and the situation remained out of control until at least 2PM, all guests had to stay on their rooms until the police went to each room to check if there were any gunmen trying to hide there.
Needless to say that nothing was open at the hotel and at the mall behind the hotel so, after all this stressful time everyone was hungry and there was no place eat around.