If a flight is cancelled due to no aircraft (bad weather someplace?) will the airlines put you up in a hotel? Thanks.

Sometimes. I think that for weather related cancellations it is harder to get a hotel voucher than if the cancellation was due to something that the airline had control over.

The website for the specific airline will probably describe their policy....Think of all the photos of people sacked out in airports for the night during bad weather....

Bad weather delays do not generally result in free hotel rooms... that's why you see people sleeping everywhere when there is bad weather. They even love to show this on TV.
Airlines are so concerned about costs right now that I would venture to say you would be hard pressed to find even one airline that would pay for a room because of weather delays.

I asked USAirways check-in guy in Boston this question this AM when it appeared our son might be stranded mid-trip in Charlotte on way to Savannah. (First leg delayed due to weather)

They said it would be at his expense, although they might be able to provide a list of available hotels.

Turns out both legs delayed, so it was not an issue.

Usually they don't when it is "act of god" or something outside of their control (i.e., the weather).

Comps like that come more often when it is something the airline screwed up themselves.

Thanks everybody -- That's what I was thinking.

For what it's worth, we just experienced this on Monday due to bad storms and ended up staying another night in Charlotte since the flight was cancelled due to bad weather. The airline, Air Tran, set us up at the hotel that they use and got us a "distress passenger" rate which was considerably less than the regular rate for the hotel. From past experience, I think that't about all you might get.