Oooh, Concorde? Interesting. Is this a heavy? Anybody know? I would think the FAA would make up a new term just for Concordes and call them "speedy" instead of heavy. I can see the ATC transmission on this one.
ATC: United 1451 heavy, be advised traffic at your 11 o clock position, no wait 12 o clock position, oh wait a minute 1 o clock, nope 2 o clock now, a British Airways Concorde at 4,000 feet, no 6000 feet, wait correct that 10, 000 feet, oops sorry he's now at Flight Level 28. Oh well, you missed him.
United 1451: Uhhhh, we're looking for him.
United 1451: We're still looking.
United 1451: Traffic NOT in sight!!!
Its better to be on the ground wishing you were in the air than be in the air wishing you were on the ground. Fly safe!