Commercial Aviation
Brian Gongol

In-Flight Magazines
United Air Lines - Hemispheres
American Airlines - American Way
TWA - Ambassador (folded upon TWA's takeover by American)
Delta Air Lines - Sky
Northwest Airlines - World Traveler
Continental Airlines - Continental Magazine
Alaska Airlines, Horizon Air - Alaska Airlines and Horizon Air
America West Airlines - America West Airlines Magazine
Air Canada - enRoute
British Airways - Highlife Magazine
Southwest Airlines - Spirit
Gulfstream International Airlines - AirCurrents
AirTran - Arrivals
Midway Airlines - Meridian
USAir - Attache
easyJet - easyJet InFlight
  - rates to advertise in several of the above

Aviation Week and Space Technology
In Flight USA

Air Transport Intelligence
The Aviation Home Page

For Pilots
Air Line Pilot magazine
Southwest Aviator (general)
Plane and Pilot magazine (general)

Management and Airline Business
Airline Executive International
Air Transport World
Commercial Aviation Report
Airline Business
Flight International
Airways magazine
Airliners magazine