By RNZ
Flightradar24 spokesperson Ian Petchenik said there will be "major changes" to the future of air travel, which won't return to any sense of normality until people feel safe.
Speaking to Jim Mora on Sunday Morning, Petchenik said there were between 75,000 and 90,000 flights a day at the moment, compared to between 175,000 and 200,000 before the pandemic.
Most flights were cargo, and passenger planes have been parked "wherever there is space".
Many were in dedicated storage facilities known as "boneyards": Air Canada was flying up to five retired planes at a time to the Arizona desert, and Chicago's O'Hare International Airport had been turned into a "glorified parking lot".