Answer: ssts

AnswerCrossword Clue
SSTSBoomers aloft
SSTSThe Concorde et al.
SSTSSolid-state technology (abbr.)
SSTSJet-set jets
SSTSU.S.-to-U.K. planes
SSTSFast planes
SSTSBarrier busters
SSTSSonic boom creators
SSTSMach-2 craft
SSTSFast jets
SSTSMach 2 transports
SSTSGrounded Atl. crossers
SSTSPiloted zoomers
SSTSGrounded fleet
SSTSErstwhile air fleet
SSTSOld jet-set jets
SSTSBoomers of yore
SSTSRetired fleet
SSTSRetired boomers
SSTSConcordes (abbr.)
SSTSFliers until '03
SSTSFast flyers, briefly
SSTSConcordes
SSTSConcordes, for short
SSTSGrounded fliers
SSTSJFK arrivals
SSTSJFK returnees
SSTSTraveler's timesavers
SSTSConcordes, e.g.
SSTSDrooped-nosed fliers
SSTSFast flights
SSTSQuickie flights
SSTSHeathrow sights
SSTSQuick planes
SSTSAir France speedsters, once
SSTSAtl. flyers
SSTSFast fliers
SSTSJetset jets
SSTSMach-makers?: Abbr.
SSTSFleet fliers: Abbr.