Airways

4 clues
Vents
Breathing passages
Routes for the jet set
Word in some carriers' names
Similar answers:
Aafair
Abridgetoofair
Abusinessaffair
Achair
Aclrepair
Adair
Adairs
Adammayfair
Adeleastaire
Adirondackchair
Afair
Afamilyaffair
Affair
Affaire
Affairedecur
Affairedhonneur
Affairs
Affairsof
Affairsofthehot
Affairtrade