Other than sending an update to address a some malfunction–what kind of update is so important that it cannot wait until landing? Can that possibly be more important than the potential security concerns this might introduce? : technology
Serious answer: updating a plane to change tactics mid-flight. This is relevant in regards to nuclear weapons, as treaties limit the amount of planes able to and rated to carry them. A software update might unlock the plane’s ability to use it’s communications equipment to interface with a Permissive Action Link (remote bomb lock which Trump controls) and/or allow the bombardier to program the bomb mid-flight.
This latter part is useful because a “nuke” can be configured between air-burst, ground-burst, bunker-buster and other plausible modes. Next-gen nukes which are designed to be directional offer even more minute control, as the bombardier can precisely dial in a target (or person…) spotted from a forward reconnaissance plane. Also, all of this can be automated and done by software that can talk between vehicles and pre-select targets for human approval. Or not, depending on how much collateral damage the Pentagon is allowed to have.