The Moon is not capable of keeping an Earth like atmosphere, nor is it practical to keep satellites in lunar orbit. Which means all transportation and communication would need to be ground based. No airplanes, no satellites, no GPS, decreased radio communication, etc.
Xenon is a heavy, colorless, dense, odorless noble gas. You would not be able to breath it, but if you inhaled some it would not kill you. It is heavy enough to make a fairly stable atmosphere on the moon. If you had enough of it you could fly a kite, fly a plane, or float a balloon. It is rare on Earth, but assuming you found an asteroid or other source of significant amounts of Xenon, how much would you need to make atmospheric plane and/or balloon operations possible?
Note: The boiling point of Xenon is 165K and the asteroid belt seems to have a temperature of around 200K, so finding a frozen ball of Xenon seems unlike, but if we did, how much would we need?