Cayman Airways (tel. 800/422-9626 in the U.S., or 345/949-8200; www.caymanairways.com) offers seven flights a week to and from Cayman Brac on Boeing 737s. The flights leave from Miami and make a short stop on Grand Cayman.
The cost of a one-way ticket ranges from US$67 to US$106 per person. Note that the larger planes that fly this route -- such as the 737s, which have 122 seats -- allow twice the luggage allotment per passenger, without payment of the additional surcharge required by the 18-seaters. If you have a lot of luggage, it's wise to book a flight on a larger plane.
Note: This information was accurate when it was published, but can change without notice. Please be sure to confirm all rates and details directly with the companies in question before planning your trip.