{TAIL ~ Interfaces} between the segments include cellular type links 127, 129 between users and {HEAD ~ aircraft} and feeder links 137, 139 between aircraft and ground stations 
{ TAIL ~ Interfaces } between the segments include cellular type links 127 , 129 between users and { HEAD ~ aircraft } and feeder links 137 , 139 between aircraft and ground stations
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH