For my upcoming trip to LAS (out 30/11 back 4/12) I was hoping for a DUB I class sale but as Wednesday is 28 days, I am ready to bite the bullet and book.

Google flights show BA and AA at £1550 but a travel agent as £1323. First and only travel agent I tried was Expedia. And indeed this was the fare.

Anything I should be aware of before booking? It was a Finn Air flight number, but assuming this won't affect TP and Avios earning?

And how would I enter my exec number so it knows I'm silver and can choose my seat.

Also any other travel agents I should be using?

Thanks in advance