Brian Flynn, a spokesman for Eurocontrol, which directs air traffic across Europe, said Ukrainian aviation authorities had closed the airspace below 32,000 feet on Monday after having earlier restricted the airspace below 26,000 feet, on July 1.
Before the crash, 300 commercial aircraft a day were flying through eastern Ukrainian airspace, with most serving as long-haul flights between Europe and Southeast Asia. Mr Flynn said such flights typically cruise at between 33,000 and 37,000 feet.
Mr Flynn said airlines can elect to avoid an area even if it’s not closed, but that he did not believe any had chosen to do so in eastern Ukraine.
“I’m not aware of any airlines that were specifically avoiding that area,” he said.