Airlines, airports and insurers across Asia are bracing for the prospect of unusually high damage with the region's tropical storm season set to begin, as hundreds of aircraft grounded by the coronavirus pandemic can't be moved easily.

Major airports in storm-vulnerable regions such as Hong Kong, Taiwan, Japan, the Philippines, Thailand and India have been effectively turned into giant parking lots as COVID-19 travel restrictions choke demand.

"If you have got those aircraft on the ground, you can imagine to get them back up and running in a short space of time is no easy thing," said Gary Moran, head of Asia aviation at insurance broker Aon. "The challenge is you can have a typhoon or hurricane coming and there are going to be a lot of aircraft that aren't going to be able to be moved in time."