[QUOTE=spinnaker;14619996]Sorry missed the "Allegheny". First you need to be sure you can return a car at those rental offices. I have heard of issues in the past. Assuming you can return a car at the County airport then it is just a short ride down to the GAP. It is a busy road so you need to be careful.
The best route is probably Route 885.
Spinnaker, is the map at this link the route you're describing? I can't see Route 885 on the map, and the bridge on this map is call Mansfield Bridge. I might have gotten it wrong. I'm going to call that airport's car rental desks to double check about car drop-offs. This would be way quicker than biking from the main airport on the Montour Trail to the GAP, if I can work out the car drop-off. So, Spinnaker, if you would please, check out this map and see if it is what you described. Thanks!
https://maps.google.com/maps?saddr=A...&z=15&lci=bike