{HEAD ~ The plurality} of {TAIL ~ commercial aircraft} in flight at any given time provides extensive geographic coverage including areas currently unserved or underserved by terrestrial cellular systems 
of
{ HEAD ~ The plurality } of { TAIL ~ commercial aircraft } in flight at any given time provides extensive geographic coverage including areas currently unserved or underserved by terrestrial cellular systems
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH