Cathay Pacific’s All Asia Pass, for instance, includes airfare to Hong Kong from New York, Los Angeles, San Francisco, Toronto or Vancouver, as well as connecting flights to 18 Asian cities over the course of 21 days — all for $1,499.

But air passes aren’t as simple as they sound. Taxes might add hundreds to the advertised fare, and the booking process can be so difficult that you won’t mind paying a travel agent to take over. (Cathay Pacific’s passes are actually sold only via agents.) To figure out if one is right for you, consider the following.

Get a good deal, but know the advantages and drawbacks.

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