The FAA expects the ungrounding of Boeing’s 737 MAX jets in the US to happen as early as late June, but each aircraft will likely need between 100 and 150 hours of work and preparation before taking to the skies again, according to airline officials.

On top of that, pilots will also need to be trained and prepped — with each airline who uses the MAX jets being responsible for providing its own regiment — following the deadly crashes in Indonesia and Ethiopia last October and earlier this year, Reuters reports.

Officials with American Airlines Group Inc., United Airlines and Southwest Airlines Co. met earlier this week in Miami to draw up plans. Some of the maintenance work that they expect to get done before clearing the MAXes for takeoff includes simple engine checks and fluid changes, along with the uploading of its new 737 software.

Southwest — which is the world’s largest MAX operator — has 34 jets sitting in storage, while United and AA have 14 and 24, respectively. The planes have been grounded worldwide since March.

Airline officials don’t plan on putting them back into service until regulators approve Boeing’s software update for its MCAS stabilization system, which malfunctioned during both crashes, according to investigators.

While sources told Reuters that the ungrounding is expected to happen in June, there’s reportedly no firm timetable. FAA chief Dan Elwell, who met with global regulators in Texas on Thursday, says Boeing has yet to submit its MCAS fix to the feds.

In addition to US airlines, Boeing itself will have to prepare roughly 30 MAX jets that are sitting in storage in Washington state, and there’s even more in Texas. The FAA says it’s not in any rush.

“It’s taking as long as it takes to be right,” Elwell said in a statement Wednesday. “I’m not tied to a timetable.”

With Post wires