Sorry, me again. I flew to the US (on United) using my third = given name as usual just before Christmas without any issues. However, the other day, when checking in at Heathrow, I was given a strong talking to by the UA check-in agent who said that continued use of my given and actual forename would no longer be acceptable when traveling to the US. Fortunately, this flight was LHR-BRU, but it made me feel a bit apprehensive about the risk of United (or another airline) refusing me boarding even if the TSA doesn't. Has anybody had any recent experiences with this?

I must the the possibility of being forced to travel under a name that neither I nor anybody else knows me by fills me with trepidation. Obviously, all my frequent traveller accounts, credit cards, and work ID and other documents are issued in my actual name.