Can my frequent flyer miles expire or transfer to other carriers?

Can my frequent flyer miles expire or transfer to other carriers?

Jen Leo (Daily Deal Blogger, LA Times Travel Section) gives expert video advice on: What is a "frequent flyer program"?; How do I accrue "miles" in my frequent flyer program?; Can my frequent flyer miles expire or transfer to other carriers? and more...

Your frequent flyer miles can expire. Check with the airline based on the restrictions in their policies, because some programs can expire after a certain or fixed amount of time while others will expire if your account has been inactive. Your frequent flier miles can sometimes transfer from one airline to another. This isn't usually done because they want to promote customer loyalty within their own airline and take maximum profit, but in certain circumstances they've made an alliance with another airline and in that case you can share your miles with one airline to another airline.