Dubai International Airport, the world's busiest airport for international travel, has briefly halted flights over an alleged drone sighting.

An American passenger jet flying from Australia to Los Angeles returned to Sydney International Airport today after crew found a written bomb threat which turned out to be a hoax.

An American passenger jet flying from Australia to Los Angeles returned to Sydney International Airport today after crew found a note carrying a bomb threat, Australia’s transport minister said.

There are reports that a "suspicious object" has been found aboard a United Airlines flight which turned back to Sydney today, 90 minutes into a Los Angeles-bound flight.

There are reports that a United Airlines pilot has turned back to Sydney 90 minutes after take-off after a security scare on board the flight.