Holiday maker giant "Thomas Cook" had 35 big planes but Thomas Cook shut down suddenly leaving 600,000 stranded worldwide. The CEO defended his $500,000 bonus Video: https://youtube.com Jet Airways India's biggest airline had 125 planes Worldwide there must be companies with 500 big airplanes that have shut down since 2018 Airbus and Boeing are trying to sell 1000 or 2000 big airplanes worldwide when some 500 airplanes are there for resale.
They're mostly owned by leasing companies, that world can be a bit counterintuitive because it's based in large part on complex tax structures. Not as simple as "Airline X fails, Boeing sells Y fewer airplanes"