I know double o but I'm going to as well.
I know that when Boston got hold of NY to tell them about 11, they were told that they were busy dealing with a hijack (175) and Boston assumed they meant 11. I also know that when NY tried to get hold of the FAA Bosses in regard to 175, they were all in a meeting dealing with 11, but I haven't heard anything about 77 being an issue, especially since Indy wasn't involved with 11 and they all thought that 77 had crashed until they learned of 11 and 175 about 30 minutes later. Can you referance a source, or is it just confusion over flight numbers?