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Q: Do airlines charge for lap infants?

A: Airlines do not (yet) charge for lap infants on domestic U.S. flights; however, they do on most international trips, typically 10 percent of the adult fare. Even if you're traveling on a "free" frequent flier ticket, your lap child will pay 10 percent of the adult fare, which can be quite a lot if you're in business class or first class. However, we don't advise holding an infant in your lap, any more than you would in a car.

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Q: We may be traveling in Great Britain this September and hear that most credit cards charge a 3 percent transaction fee for charges made outside of the United States. Is Capital One the only one that does not?

A: As far as we know, Capital One is the only widely accepted major credit card issuer that does not pass along foreign transaction fees. You'll also pay a foreign transaction fee with most cards even if you're in the United States but buy something from a company based overseas. Some credit card issuers charge more than 3 percent, so shop around.

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Q: Is there a simplified way to find out if it's cheaper to buy separate one-ways on two different airlines vs. a round-trip fare online on one airline? I've found, for example, that it's cheaper to fly on JetBlue from New York to Nassau in the Bahamas and then to buy a separate ticket on Bahamasair to some of the smaller islands in the Bahamas rather than one "through" fare. Sites like Kayak and Orbitz don't do this.

A: Currently, the answer is no. What you're asking about is a "split" fare strategy, something that a good travel agent would be able to put together. Despite giant strides in online airfare booking, current fare search technology isn't capable of combining fares like the one in your example.