Please check and let me know, if it is correct (to have crashed). It does not sound good to my ears but I am not a native English speaker. I have been learning English without learning grammar (as a native English speaker). Some times when I read which is not familiar to me, I ask questions here to clear my doubts.
The Malaysia Airlines flight carrying 227 passengers and 12 crew went missing in area near the South China Sea on Saturday as it flew from Kuala Lumpur to Beijing and was presumed to have crashed.