How do they shoot a video of a flying airplane in sky.. mostly used in airlines tv commercials?

Clay Lacy Aviation, does 90% of all air to air filming or movies and commercials -

Movies like "Airport", "Top Gun", or "Air Force One" were made by them -

Almost all TV commercials are made from their Learjets - "Astrovision" -

Cameras are inside the cabin, shooting through a periscope system -

Can be used up to maximum flight level of the airplanes - 45,000 ft -

I used to fly for them, part-time in the 1970s-1980s -

http://www.claylacy.com/astrovision.html

And for those of you "experts" who still cannot read... -

This one is filmed air to air in Astrovision by Clay Lacy -

Only periscope system permits "panning" around an airplane -

You could not do this filming through a side window -

http://www.youtube.com/watch?v=YmQE05i1l0s

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The images are shot from another airplane. Sometimes the photographer's airplane is specially adapted for the purpose, with special platforms or windows that give a clear view of the outside for shooting.

Formation flying

From another airplane.

I think they shoot that from another Airplane

I guess they use helicopters, with the cameramen inside, to fly in the air and film it. They wouldn't go too close, probably fly far away and zoom in.

they get superman to do it

....seriously they just use another plane