“Why, it’s as easy as landing on a barge...”
...or an aircraft carrier.
Meaning that it’s not easy but it’s not impossible, either.
An aircraft carrier is moving at roughly 40MPH at sea level into the wind. The landing and take off speeds increase with altitude.
I am also curious as to how it is kept stable. The Sears Tower for example the Willis(Sears) Tower sways about 3 feet and it is a fairly rigid structure. This elevator is about 40 times as high and is inflatable.