In my opinion, travelpayouts is one of the best travel CPA networks. Payment is accrued as a share of the income of the service itself, as well as from the payment of orders by users. There is a detailed statistics in my personal cabinet, but it produces data with a delay, you need to get used to it. There are many widgets from the companies themselves, which are easy to place on the site. I also recommend reading other reviews about Travelpayouts, I found their review on Revieweek (https://revieweek.com/review/travelpayouts/). I recommend the affiliate network.