[meritflyer]

Originally Posted by Doug Taylor

A - Where the "A"irliners are. Generally above 18,000'
B - "B"ig airports, generally places like ORD where everyone's under positive control and you need clearance to enter
C - "C"ommunications. Air Traffic area where you need to establish two-way communications before entering.
D - I can't remember an easy one
E - "E"verything else.

Okay Martha..

D is for dialogue.