Ever dream of seeing the Eiffel Tower? See how welcome bonuses and travel perks on these three cards can fully cover your next transatlantic flight.

The top of the package would be a standard credit card size, 3 3/8 inches wide by 2 1/4 inches long. The package can be any height, but 7 inches is probably a practical maximum.

American Express Co. teased updates coming later this year to its travel-focused Platinum credit cards, announcing what it called its “largest investment ever” in a credit-card refresh.