Q. My daughter and her husband travel overseas many times a year. She mentioned that even though their passports will remain valid for another six years, they've run out of space for the customs agents to stamp. Would this mean they have to apply and pay for a new passport?

A. Prior to January 2016, travelers running low on passport pages could simply send away for an additional 24 visa pages to be sewn in, no problem. This practice has since been discontinued. Nowadays, should you run out of pages, you'll need to complete this form and, yes, send away for a brand new passport.

Applicants can opt for a bigger 52-page passport book, or the standard 28-page book. The $110 renewal fee is the same for both passport books. Need it in a hurry? Tack on an additional $60 for expedited service.

You can find more info on passport application fees at travel.state.gov.

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