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