Most incidents involve face masks, but alcohol plays a big role too.
In November, a warning from the Federal Aviation Administration about safety concerns led to AT&T and Verizon postponing the launch.
In addition to reducing wait times, the FAA estimates this will reduce greenhouse gas emissions.
The industry's growth raises questions about how the FAA manages spaceports and their impact on surrounding communities.
Passenger numbers are bouncing back. But for business destinations and international hubs, the recovery is taking longer.
Airlines using Boeing's 737 Max will have to get FAA approval for pilot training programs and complete required maintenance.
Those in charge didn't necessarily understand everything about the plane's design or the safety lapses.
Air safety regulators say Boeing can start test flights of its grounded 737 Max jets.
The aircraft maker has continued to pump out the beleaguered planes, even though it can't deliver them.
The longer the company's 737 Max jet stays grounded, the more impact Boeing suppliers and customers feel.