FILE PHOTO: Boeing 737 MAX aircraft are parked at a Boeing production facility in Renton, Washington, U.S., March 11, 2019. REUTERS/David Ryder

DUBAI (Reuters) - Saudi Arabian airline flyadeal will wait until investigations into two Boeing 737 MAX crashes are completed before deciding whether to proceed with a signed order for 30 of the jets, its chief executive said on Friday.

The 737 MAX has been banned from flying in most countries after an Ethiopian Airlines crash on Sunday that killed all 157 people on board. This was a second deadly incident involving the relatively new Boeing model in five months. In October, a Lion Air jet crashed in Indonesia killing all 189 people on board.

“We’re in a hold for the moment. We are monitoring and in constant contact with Boeing and will wait for the outcomes to be known before moving forward,” CEO Con Korfiatis told Reuters by phone.

Flyadeal ordered 30 Boeing 737 MAX 8s last December with purchasing options for 20 more in a deal Boeing said was worth $5.9 billion at list prices.

The budget carrier, which started flights in 2017 and is owned by Saudi Arabian Airlines (Saudia), chose the MAX jet over Airbus’ narrowbody A320neo.

The United States on Wednesday joined most countries in grounding the 737 MAX over safety fears. Acting Federal Aviation Administration (FAA) administrator Daniel Elwell has said he does not know how long the U.S. grounding will last.

Saudi Arabia has not said whether it has grounded the plane. It has been grounded in neighboring United Arab Emirates and Oman.

Emirati carrier flydubai this week said the 737 MAX remained integral to its future strategy and that it valued its long-standing relationship with Boeing.

Flydubai is one of the largest MAX customers having ordered 250 of the new model narrowbody jets since 2013. It currently has 13 MAX aircraft in its fleet.