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I am surprised that no one mentioned ITA Matrix, the search engine behind Google flights.

https://matrix.itasoftware.com/search

The results will show the raw codes, eg. ticket class, fare construction & other airline codes.

Use the result you like to book with an agent, or https://bookwithmatrix.com

What's the advantage of this? Whenever I tried, the UX seems so much worse than any other service. If it's the same data anyway, why not consume it from an easier to use service?

For most, none.

For power users, you can force specific fare classes/connections/combinations etc. regular sites won't. You can create some zany things for example, getting United to sell you an American connection. Ticketing it may require an actual travel agent though.

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