I've been playing a lot of Metal Gear Solid V lately and I love their use of the Fulton balloons to bring NPCs, supplies, vehicles, and animals all back to your base. This seems like something that would work amazingly in Fallout 4 with settlements.
For those who don't know the Fulton balloons basically secure a person or an object, then whizz them up into the sky at break-neck speeds. In MGS and real life (yes this is based off of a real thing) an airplane would pick up these targets, but for the sake of convenience and lack of aircraft aside from vertibirds they could take whatever you lift to any settlement of your choosing. Perhaps even build a landing pad object at a settlement to allow this? This would work with not only NPCs and certain creatures (great for the upcoming settlement DLC) but power armor suits, deployable boxes of loot so you don't have to lug around all those desk fans, and lots of other applications!
Obviously we can't do too much without the GECK (at least I couldn't) but maybe someone out there is talented enough to script it all together. I would be up to assisting with making the actual assets like the balloon itself.