Good question, I should add this one to the project's FAQ. We're still thinking in the best way to solve the Vulcan problem. To extend the map seamlessly to include Ascension Island, will mean getting the entire brazilian coast as well (Vulcan's did most of the air-to-air refuelling with Victor tankers parallel to the brazilian coast, in one situation, one missed a refueller and had to make an emergency landing in Brazil/Rio de Janeiro - it was "Black Buck 5" mission, carrying Shrike anti-radiation missiles if I remember well).
It is technically not impossible to do this, problem is 1) time to create the huge scenary (texture tiles, featured cities in the coastline) 2) extreme RAM usage. A down to earth approach at the moment is to make the Vulcans (currently A.I. only) to ingress in the campaign's map through the most north/east position, they do their business down in the war zone, and return through this same route.
Another approach would be to include Ascension Island as a separated map but co-existing with our current map, with correct distances between the 2 areas correctly calculated as well as flight times and fuel usage - of course there will be a gap between the two areas, but at least players will be able to see Vulcans departing from Ascension Island in direction to their targets, hours away of flight in the south direction.
Best regards,
Dante - Jet Thunder Project
http://www.thunder-works.com