Here’s an example of a life saving application you could imagine being enabled: there’s a huge problem with getting organ donors’ organs to meet supply where demand is (why there’s state level registries instead of a national one). If there’s constantly these jets buzzing about, you could imagine regulations that require them to aid emergency personnel transporting organs when such transports come up - it’s not like you’re transporting anything big / you don’t actually need to transport people - just make sure every flight can appropriately have it attached and then you toss it on when it needs to go somewhere better than is available in the local vicinity (and heavy fines and pilots losing licenses if they detour from their declared destination).