Is it permissible for me to continue studying aviation and working at the airport, despite the presence of an environment full of temptations, and the existence of requirements that necessitate shaving the beard, and with my parents' anger at me for not taking the preparatory job, and the delay of my marriage because of that?

The matters mentioned, such as the presence of unveiled women, idle talk, obscene language, backbiting, slandering, the existence of a beauty school, shops where unveiled women are abundant, and few who remember Allah, necessitate your distancing yourself from this college and seeking another institution where you can feel secure about your religion. If you cannot find another and are in need of it for your livelihood, then it is permissible for you to remain there out of necessity, and it is obligatory for you to leave it whenever you are able to do without it. Your marriage is good because it helps in lowering the gaze and protecting one's chastity. If the preparatory work requires shaving the beard, then if you can find another opportunity through which you can escape the trials, it is forbidden for you to remain in your current state. If that is not possible, then it is a necessity for you.