неофіційна зустріч
brief meeting
head-on meeting
march in anticipation of meeting engagement
meeting engagement
air coordination meeting
off-book posting
off-route (off route)
off-design / off design
lift-off / lift off
on-off keying; on/off keying (OOK)
message book
captain's request book
battery emplacement book
book detonator
emplacement book
reference book
flight book
log book
pilot’s log book
absentee book
account book
account book card
account book code
arrival report book
war-book
order book
orderly book
work book
year book
service-and-conduct book
service-and-pay book
record book