For those with large collections of airchecks that you fear becoming lost to the ether once you're gone:
Why not upload all your MP3s and WAVs to the Internet Archive? In spite of the legal wranglings that have occurred as of late, it is not necessarily the case that potential future difficulties hosting certain kinds of contents, like books for rent, will have any effect on "ephemeral" types of media, or essentially what in the software world is called abandonware. It's also physically the most ideal place to store large volumes of media, as users with accounts may upload files of any kind
and size. I have seen individuals create single repositories with thousands of files weighing in at hundreds of gigabytes total. Each collection receives a unique URL, and it can be browsed and downloaded similarly to how web browsers used to display the contents of FTP site directories. (What you upload doesn't get ensnared within fifty megabytes of JavaScript powering multi-layered menus with time-consuming hoops to jump through in order to download each file, like with certain commercial file hosting services.)
Here, for example, is one user's collection of 1940s wartime radio.
https://archive.org/details/WartimeRadio1940
It is rather small at only 160 MB, but by simply clicking the "SHOW ALL" link under "DOWNLOAD OPTIONS," you can directly list and download the individual files the collection consists of in an FTP (or Apache "Index of /") directory listing format:
https://archive.org/download/WartimeRadio1940
If nobody has ever bothered looking, the Internet Archive is swarming with these kinds of accounts, filled with people's personal uploads of all varieties of things. Just for example, when searching the term "aircheck" alone:
https://archive.org/search?query=aircheck
The benefit of using the Internet Archive for storage of audio and video media is that, unlike with Youtube, there is no content ID gestapo. Your files are also preserved as-is without being transcoded (the way Youtube transcodes the audio tracks in all videos to conform to standard, site-wide AAC and Opus bitrates).
To David Eduardo in particular, I am wondering whether a different part of the Internet Archives -- its "Archive-It" collections services -- could in any way help you. It is intended for hosting content at scale, like on behalf of non-profit libraries and other archivist institutions. I would say WRH qualifies as an institution. Have a look at the links below. The service allows searching within collections and distributes content to more than one data center for backup as well as regional internet outage resilience.
https://archive-it.org/
https://help.archive.org/help/archive-it-information/