Last night, Tigerair flight TT271 was forced to return to Sydney following the discovery of a supposed "threat" mid-flight.
The "written threat" was found on the flight from Sydney to Melbourne after departing, shortly after a 7.05pm departure, news.com.au reported.
The flight was greeted by police on the runway who ordered passengers to remain seated and keep their phones switched off.
A spokesperson for Tigerair Australia said in a statement that it was the captain's decision to ground the aircraft as a precautionary measure following the discovery: