The Directorate General of Civil Aviation (DGCA) late on Tuesday ordered "grounding the Boeing 737-MAX planes immediately" after aviation authorities across the globe, with the notable exception of the United States, made a decision to ground the particular aircraft following Sunday's crash of an Ethiopian Airlines' aircraft of the same model killing all 157 people on board.
"They don't have another 24 jets just sitting parked somewhere that they can bring into service to cover it.They'll have to cancel flights", he said.
Boeing shares dropped as much as 2.5% to $365.88 following Trump's announcement.
Muilenburg called Trump after the president complained Tuesday on Twitter that planes "are becoming far too complex to fly".
The largest operator of 737 Max 8s in the US, Southwest Airlines, is offering passengers scheduled to fly on one of the Boeing planes the chance to change their bookings.
Southwest long ago decided that having the same plane, with the same maintenance and tool needs was the best way to run an airline.
In a federal filing last month, Southwest reported it plans to dramatically increase the number of Boeing 737 Max 8 aircraft in its fleet over the next few years as part of a fleet modernization initiative, saying the planes are fuel-efficient. It also reviewed satellite data it obtained earlier in the day.
He said that "the evidence we found on the ground made it even more likely the flight path was very close to Lion Air's".
USA airlines that operate the 737 MAX, Southwest Airlines Co, American Airlines Group Inc and United Airlines, said they were working to re-book passengers.
Ethiopia cannot read black boxes, 'might' send them abroad: airline
A slew of other countries have, however, grounded the jet after one of them took off from the capital of Ethiopia over the weekend and crashed shortly after takeoff, killing everyone on board. They should notify the passengers before. However, a more formal fix to redesign it won't be mandated until April, the FAA said Monday. Boeing said late Monday it will deploy a software upgrade across the 737 MAX 8 fleet "in the coming weeks".
The crashes prompted numerous airlines and countries to announce this week they were grounding the gets pending investigation into the cause.
"Trump said any plane now in the air will go to its destination and then be grounded, adding that pilots and airlines have been notified".
The single-aisle 737 MAX, first delivered in May 2017, has been Boeing's best-selling plane ever, with more than 350 planes registered and about 5,000 on order.
Ethiopian Airlines spokesman Asrat Begashaw said it was still unclear what happened on Sunday, but its pilot had reported control issues - as opposed to external factors such as birds.
"It's a awful, bad thing". "They are working very, very hard right now, and hopefully they'll very quickly come up with the answer".
Boeing has said it has full confidence in the 737 Max - a model that has 371 jets in operation around the world. In contrast, its fleet includes more than 500 of the older 737-700 model. The European Union, India and Canada, among others, have temporarily prevented the Max 8 planes from taking to the air. The carrier had been using five of the planes and awaiting delivery of 25 more.
This is the second time the FAA has halted flights of a Boeing plane in six years.
In 1979, the FAA grounded the McDonnell Douglas DC-10.