Malaysia Airlines rerouted a flight over Syria on Sunday after its usual path over Ukraine was closed, reflecting the challenges airlines face in finding conflict-free routes between Asia and Europe.

After Malaysia Airlines Flight MH17 was shot down Thursday by a ground-to-air missile in eastern Ukraine, airlines began to avoid the airspace above where the Ukrainian military has been fighting Russian-backed rebels.

Swedish flight tracking service Flightradar24 AB posted a flight map on its Twitter account on Monday showing the change in the route of Malaysian Airlines flight MH4, which flies from Kuala Lumpur to London.