How to hang up in air??

• Two programmers walk along the street. The first says to another one, " Listen, people say that the software for a new american invisible plane, “Stealth-2” will be worked out by Microsoft"
The second man says, " I think it is connected with the fact that a new plane must know how to hang up in the air ".

....

???


:D

haa haaa haaaaaaaaaaaa

thats seemss the operating system of the plane is windows... :D