Okay I have been working with some guys with deploying the refueling probe on the F/A- 18 so we can try to do a in-flight refuel. Problem is, we couldn't figure out what specific key we can use to extend or retract the probe. After spending some time working around the F/A -18 panels I found the switch:

This switch will allow you to extend and retract the probe for refueling....now the real trick is to dock with a refueling aircraft to get fuel; if anyone flies them!!! I am working on seeing if I can get my Viking (see multiplayer thread) to carry extra fuel to refuel other aircrafts. 😀
later.
Captain
First Officer
Trainee