I don't know for sure if the radio in the airport can manage both at the same time.
As far as I can tell on my network here the dual band Time Capsule can simultaneously send and receive on both the 2.4 and 5 GHz bands simultaneously. Of course, it could be switching between transmit and receive so fast as to be undetectable in normal service.
"All you've got to do is own up to your ignorance honestly, and you'll find people who are eager to fill your head with information" --Walt Disney
