As with the strikes in March, the airline is also planning to lease extra aircraft from other carriers and re-book passengers on cancelled flights onto other airlines.
Treasury also sanctioned companies and individuals from Kyrgyzstan, Ukraine and the United Arab Emirates that lease and sell aircraft to two Iranian airlines the United States says is involved in illicit activities to fund and support Iran's elite Quds Force.
On Saturday, Thomas Cook said it is "at an advanced stage" in the negotiations to sell and lease back between 17 and 19 aircraft as part of its effort to boost liquidity.
Last year Ecuador's government ended the lease under which American AWACS and Orion aircraft flew surveillance missions to spot drug movement in the eastern Pacific from a base at Manta.
About 700 African entrepreneurs and companies (not including the scheduled airlines) currently own or lease nearly 1, 200 jet and turboprop aircraft for business purposes.