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