Ballooning...

Phidippus is one such genus.

I watched a large female balloon right into my backyard a couple years ago.

I think that ballooning behavior is very frequent among young dispersing spiderlings, but not exclusive to them. Certainly in Araneidae that become large as adults, ballooning is mostly the province of emerged spiderlings up to small immatures, the large ones are probably beyond that size (aerodynamically). There are scattered papers in the literature about larger spiders, including mygalomorphs!, that have exhibited a type of ballooning that involves a sort of hanging from a thread to start, rather than the "typical" release of very fine lines while standing on tip toes with abdomen tip pointed up. Certainly many adult tiny species, such as sheet weavers (Linyphiidae) often balloon. By the way... I've been recently contacted by a film corporation enquiring about how to film ballooning events. If anyone wishes to provide the details of any spectacular event they observed (weather conditions, date, habitat/locality) I'd love to hear the stories. I had a good one in Nov 2010 from a long fence in a grassy field. Cool clear day, with nice gentle breeze and sun-generated rising air currents, the ballooners included many small wolf spiders (Pirate, Pardosa, young Hogna) as well as a few crab spiders (Xysticus imms).