No-fly zones and other restrictions are being imposed because of Russia's invasion of Ukraine.
Russia invaded early Thursday after Ukraine closed its airspace to civilian flights.
Wizz Air said Friday that it was trying to get crews out of Ukraine.
Christie Rawlings said in an email that they are still trying to get them out at the earliest opportunity. The majority of our employees are Ukrainian.
The airlines stopped flights to Ukraine.
The company told CNBC on Friday that it was cutting some flights to Russia so crews wouldn't have to stay overnight.
No-fly zones were extended to parts of eastern Russia. Many airlines have avoided eastern Russia since the Malaysia Airlines flight was shot down.
FlightRadar24 website, an online flight tracker shows no aircrafts flying over Ukraine after the Russian attack.The backlash to Russia's invasion included British officials banning Russian carrier Aeroflot from landing there, leading to a response from Russia that prohibits British carriers from using its airspace.
In the days leading up to the invasion, airlines were reassigning planes around the potential conflict zone.
Any diversions that aircraft have to make around the no-fly zone is going to add to fuel costs.
At a time when airlines are already grappling with a surge in fuel prices, higher costs would come.
The United Parcel Service began flying a more southerly route around Ukraine last week.
The airline said in a message to pilots that it was a viable alternative to provide safe and efficient operations.
A spokesman for the airport told CNBC that some international carriers inquired about fuel and ground support availability. If more of Russian airspace is closed to airlines, the questions are a sign that contingency plans are being developed.
Delta Air Lines suspended its codeshare agreement with Aeroflot on Friday, which allowed the carriers to book seats on one another's flights.
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