Singapore and Australia's aviation authorities on Tuesday have temporarily banned Boeing 737 Max aircraft from flying into and out of their countries.
The decision comes after an Ethiopian Airlines Boeing Max 8 crashed on Sunday, killing 157 people on board.
It was the second fatal accident involving that model in less than five months, reports BBC.
Singapore's Changi Airport is the world's sixth busiest and a major hub connecting Asia to Europe and the US.
But only a handful of airlines operate Max aircraft in and out of the country.
No Australian airlines operate the Boeing 737 Max, and only two foreign airlines - SilkAir and Fiji Airways - fly the model into the country.
Shane Carmody, who is in charge of aviation safety at Australia's Civil Aviation Safety Authority, said the suspension would remain in place while the organisation awaited "for more information to review the safety risks".
Several airlines and regulators around the world have already grounded the Max 8 model following the crash.