(military) squadron

aviation

age, era, period (of time) / the times, spirit of the age / antiquity / a time in one's life, one's days (in college etc.)

aerospace

soon after / presently / almost, all but, no more than / after all

eventually, finally, in the end / not before long, soon / almost, nearly (usually with time phrases) / (archaic) as it is, unchanging / (archaic) immediately / (archaic) exactly

幾日も幾日も: day after day

変わる, 変る: change, be changed / 替わる, 替る: substitute, be substituted, take one's place / 代わる, 代る: take one's place / 換わる, 換る: be replaced

航空機: aircraft

(engineering) aerospace engineering