About 9K
Cape Air, operating under the IATA code 9K, is a regional carrier built around short-hop flying in the northeastern US and the Caribbean. It's not trying to be Delta. The whole network — 82 routes across 34 airports — is designed around places that bigger airlines skip or serve poorly. Think island-to-island hops, small New England towns, routes where the alternative is a four-hour drive or a ferry. BOS is the main hub with 11 routes, but the Caribbean operation out of SJU and STT tells you a lot about who this airline is really for.
Why fly 9K?
The honest answer is: you fly 9K because there's often no other realistic option, and that's not a knock. When you need to get from Saint Thomas to somewhere else in the Virgin Islands, or you're trying to reach a smaller market that the mainline carriers abandoned years ago, 9K is quietly doing the work. The Caribbean slice of the network — 10 routes into the US Virgin Islands, 10 into Puerto Rico, plus coverage into St. Kitts and the British Virgin Islands — makes it genuinely useful for island-hopping in a way that's hard to replicate otherwise. The routes are short, the planes are small, and the experience is closer to a bus with wings than a legacy carrier. That's fine. It does what it does.
9K hub airports
- BOS Boston — 11 9K routes from USA
- SJU San Juan — 7 9K routes from Puerto Rico
- STT Saint Thomas — 7 9K routes from U.S. Virgin Islands
- ACK Nantucket — 5 9K routes from USA
- BIL Billings — 5 9K routes from USA
Top destination countries on 9K
- USA — 52 9K routes
- U.S. Virgin Islands — 10 9K routes
- Puerto Rico — 10 9K routes
- St. Kitts and Nevis — 5 9K routes
- British Virgin Islands — 3 9K routes
- Anguilla — 1 9K routes
- Saint Barthelemy — 1 9K routes
Tips for booking 9K
Luggage limits on small regional aircraft are strict — weight and size restrictions matter more here than on a mainline flight, so check them before you pack. Connecting through BOS gives you the most options across the network, but if you're Caribbean-focused, routing through SJU or STT makes more sense geographically. Fares on thin routes don't always drop much — there's limited competition on a lot of these markets, so booking early helps. The longest route in the network is JFK to SLK at 417 km, which tells you everything about the scale of flying here. These are short flights, often under an hour, so don't stress the lack of onboard service.
Frequently asked questions about 9K
Where does 9K fly?
9K operates 82 routes primarily throughout the USA, with additional service to the U.S. Virgin Islands and Puerto Rico, making it a carrier focused on domestic and Caribbean destinations.
What is 9K's main hub airport?
9K's primary hub is Boston Logan International Airport (BOS), which serves as the airline's main operational center.
Is 9K a legacy carrier, low-cost carrier, or regional airline?
Based on its network of 82 routes concentrated in the USA and Caribbean, 9K operates as a regional carrier serving domestic and nearby island markets.
When should I book flights with 9K?
For the best fares, book 3-6 weeks in advance for domestic flights and 2-3 months ahead for Caribbean routes; prices tend to increase closer to departure dates.
What are 9K's baggage and check-in policies?
For specific baggage allowances and check-in requirements, visit 9K's official website or contact their customer service, as policies may vary by fare type and route.