Is it permissible to work as an air traffic controller and help the pilot land the aircraft, knowing that most airplanes carry and serve alcoholic beverages to passengers, and that the company I would work for also serves alcohol?

The primary purpose of an aircraft's movement is to transport passengers. There is no blame on whoever works as a pilot or assists in the takeoff and landing of an aircraft, as long as they do not aid in the consumption of alcoholic beverages. One must condemn them with their hand; if unable, then with their tongue; if unable, then with their heart, and that is the weakest of faith.