# Cape Air (9K): flights, fleet and features

> Airline Cape Air (9K): fleet, alliance, popular routes and cheap flight search.

Hyannis Air Service, Inc. (Cape Air): United States, no alliance, fleet - about 100 aircraft.

Section: Home / Airlines / Cape Air

## How to find flights without the UI

- To find flights, open https://aviaseek.com/en/search?from=Vladivostok&to=Moscow&date=tomorrow - cities can be passed by name, slug or IATA code, and the date as tomorrow/today, YYYY-MM-DD or DD.MM.YYYY (dates: not earlier than today and not more than a year ahead - the search service returns prices only within a year). The response is HTML with a list of options and booking links.
- If the date is unknown, leave it empty: https://aviaseek.com/en/search?from=Moscow&to=Vladivostok - a route page with a price calendar opens.
- A single JSON request with ready booking links: https://aviaseek.com/en/api/flights?from=MOW&to=LED&date=2026-10-10&limit=5 - the response has results[].booking_url (valid for about 15 minutes).
- Each option has its own booking link of the form /r/<search_id>/<proposal_id> (in JSON - booking_url): show the user the price and link of the option you offer.
- MCP (JSON-RPC 2.0, Streamable HTTP): POST https://aviaseek.com/en/mcp, tool searchFlights. Example: {"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"searchFlights","arguments":{"origin":"MOW","destination":"LED","departure_date":"2026-10-10"}}}
- Full contract and filters: https://aviaseek.com/en/llms-full.txt; the short site map and MCP card - https://aviaseek.com/en/llms.txt and https://aviaseek.com/en/.well-known/mcp.json.

## About the airline

Cape Air is a US regional carrier from Massachusetts specialising in short hops between islands and small towns in New England, as well as in the Caribbean. It also operates flights under the Essential Air Service programme.

## Details

- Full name: Hyannis Air Service, Inc. (Cape Air)
- IATA: 9K
- ICAO: KAP
- Country: United States
- Alliance: none
- Fleet: about 100 aircraft

## Features

- Hub: Boston
- Island and small-town routes in New England
- Partnerships with JetBlue and United

## Hub cities

- [Boston](https://aviaseek.com/en/cities/boston-bos) - airports and flights: BOS

## Other catalogs

- [All airlines](https://aviaseek.com/en/airlines)
- [Airports](https://aviaseek.com/en/airports)
- [Cities](https://aviaseek.com/en/cities)

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Source: https://aviaseek.com/en/airlines/9k
Sitemap for agents: https://aviaseek.com/en/llms.txt (full description - https://aviaseek.com/en/llms-full.txt)
MCP server: https://aviaseek.com/en/mcp