Boeing Co. said Thursday it has completed a software update for its 737 Max jets, which have been grounded worldwide since March after they were involved in two fatal crashes.

The announcement is a sign of progress for the aircraft-maker's efforts to get its best-selling jetliner back in the sky after a grounding that has already lasted more than two months.

The airplane manufacturer said it was providing additional information to address requests from the Federal Aviation Administration including details on how pilots interact with controls and displays in different flight scenarios.