One Crazy Crazy Hijacker (1973)

Two apartments of an apartment building with common balcony, living two same-sex couples. At one resident Stephen with Fanny and the other Myrto with Tatiana. But other things show and others are as well in the apartments live two married couples. Stephen with Myrto and Fanis with Tatiana, who keep hidden their marriages, because women working as hostesses in an airline that does not allow their marriage...