The craft is lighter than {HEAD ~ air}, such as {TAIL ~ a dirigible airship} , and has flat projection surfaces on each of its sides 
such as
The craft is lighter than { HEAD ~ air } , such as { TAIL ~ a dirigible airship } , and has flat projection surfaces on each of its sides
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH