were airlifting
Past progressive conjugation of airlift. There are other translations for this conjugation.

airlift

Veterinarians working on the base were horrified that Special Forces planes were airlifting goats up from Central America, without going through the normal Customs inspections.
Los veterinarios que trabajaban en la base estaban horrorizados de que los aviones de las Fuerzas Especiales estuvieran trayendo cabras de Centroamérica sin pasar por la inspección normal de aduana.
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