Airbnb hosts have long had the opportunity to offer free housing during emergencies. What about making yourself available ahead of time? If you live in the right area, you're set. The home rental service is launching a pilot program that will let San Jose residents put themselves on a standby list before there's even a hint of a crisis. The move should speed up the community's response in the event of a crisis, ensuring that stranded people don't have to wait for shelters over their heads.