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