This is a suggestion for the mapping team:
When doing a cross country tour, it is my impression that most cyclists arrive at an international airport and start to look for all sorts of transportation solutions to get to the starting point. People consider renting cars, going by bus, amtrak, having the bikes shipped by UPS to a local bike shop etc etc. All solutions require lots of planning, confusion etc etc.
It is also my impression that most cyclsist would love to assemble the bike at the airport and hit the road straight away. The problem with airports is typically heavy congested areas, lots of traffic and limited accomodation. You might arrive at the airport during late hours and have great difficulties orienting yourself.
Summer 2012 I biked across USA following the Transam and arriving at Washington Dulles International Airport. I decided to go straight for the Transam at Rockfish Gap and not backtrack all the way to Yorktown. Thus, I needed at route from the airport to Rockfish Gap. This was accomplished by using Google Maps and carefully study the roads. I also found a private campground on the way to Front Royal, VA which was part of my route. Then I printed a park map for the Skyline drive which would take me all the way to Rockfish Gap. On the park map all accomodations were listed and this information was extremely useful.
I think it would be of great value for many cyclists to have such a "spur" (which you use frequently on your maps already) where a main route is connected directly to a major airport.