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