Malaysia Airlines filed a flight plan requesting to fly at 35,000 feet throughout Ukraine airspace but was instructed by Ukraine air traffic control to fly at 33,000 feet upon entry, it said in a statement late on July 18.
Murder In The Sky: Malaysia Airlines Flight MH17
Reuters: Malaysia Airlines says requested higher flight plan

Photo shows Malaysia Airlines flight MH17 leaving Schiphol Airport in Schiphol, the Netherlands, on July 17, 2014.