Owned aircraft don't cost much to park for long periods. But unless one can get out of long term leases, parking leased aircraft makes almost no sense (unless loads stay down 90%). As of our last annual report we were leasing:

2 of 16 764s
13 of 38 763s
12 of 21 753s
5 of 53 752s

So, 32 756 aircraft that we could very well keep flying right up until their leases expire. Long enough to bring back portions of the remaining fleet as the economy improves.

Below is an excerpt I made from a long post I made in Aug 2017, I still tend to think it holds true. But the NPDM may clearly point elsewhere. Fingers crossed. Fleet Discussion and News

"The five more 798-9s we have coming in the next six months plus the 14 787-10s we have arriving starting next year will allow our oldest 756s and 777s to continue being moved from international to domestic p.s. type service where they can receive more care and feeding from maintenance... or be parted out if the economy tanks.

I think this general trend of removing our oldest larger jets from international services will continue until a MoM aircraft enters service. I think the MoM will be used primarily for transcons and TATL services, allowing the hodgepodge of geriatric jets being used for p.s. service to be retired en masse"