Is it obligatory for a pilot to leave his job if he will be working with a female co-pilot in a closed cockpit, knowing that this rarely happens and that leaving the job might make way for the unsuitable?

Seclusion with a non-mahram woman (khalwa) is forbidden by Islamic law. It is a gathering where suspicion is not safe. Among the proofs of its prohibition are the Prophet's (peace be upon him) sayings: "No man should be alone with a woman except with a mahram," and "No man is alone with a woman but Satan is the third of them." Prohibited seclusion includes being alone in a car or elevator, or with a doctor or teacher, and the seclusion of a male employee with a female employee at work.

Working in the aviation sector, if it involves prohibited seclusion or if forbidden acts cannot be avoided, is impermissible. This is due to the exposure to temptation, especially with immodest display (tabarruj) and women traveling without a mahram. It is not true that pious individuals abandoning this work leads to empowering impious ones. The prohibition pertains to circumstances that lead a Muslim to commit forbidden acts and expose them to temptation, not to working in aviation itself.

We must adapt our circumstances to conform to the Sharia, not adapt the Sharia to whims or circumstances, as Allah Almighty says: "So for that, invite, and stand firm as you have been commanded, and do not follow their inclinations."