by calaisbranch
At least until a few years back, there was a combined GRS/Pan Am publication called GuilfordXpress which came out quarterly. Could have been an "inside" publication. It's kind of older now, but I'm looking right at the one from April/May/June of 2003. The issues were normally 14-18 pages long with RR info first, airways second. Sometimes, these would be followed by features on rail safety/police, customer spotlights, maps, etc... Offhand, I'm not sure it's still published. However, I could probably find out pretty quickly.
Jeff
Jeff