Historically, the most significant bans involve the Concorde and the Boeing 737 MAX. The Concorde was famously "banned" from flying over land in many countries for decades due to the sonic boom it created, which effectively limited its commercial viability. However, in a major 2026 update, several new supersonic regulations have been passed (following the "Concorde Bill" of 2025) to allow for "low-boom" supersonic flight over land. More recently, the Boeing 737 MAX was globally grounded for nearly two years (2019–2021) following two fatal crashes linked to its MCAS software. While the MAX is back in service in 2026, it remains under the most intense regulatory scrutiny in aviation history. Additionally, some older, noisier aircraft like the McDonnell Douglas DC-10 have been "banned" from many international airports due to modern noise-pollution laws, highlighting the industry's shift toward quieter, more efficient flight.