Is it permissible for my husband to work as a co-pilot at "EgyptAir" after studying at the Aviation Institute?

The basic principle is that this profession is permissible and beneficial to people; it is considered an act of charity if you intend to help people. The doubt arises when passengers are allowed to drink and are served alcoholic beverages, but "EgyptAir" does not permit this. Therefore, there is no harm in working for it.