Airline Pilot

I'm an airline pilot, so my family flies everywhere. We often go last minute and have to fly standby, so We are looking to buy a timeshare that allows maximum flexibility on property location, high quality locations, and flexibility on duration of stay with very short notice booking capability. We often plan to stay much less than 7 days at a time as well. Most times just a day or 2 or over a weekend. Does something like this exist?

The only possibility I can see is if you check ads for rent and someone hasn't rented out their unit and still has it listed. That doesn't leave much time to confirm the reservation and get a guest pass for you to use the timeshare .