I looking affiliate programs about air tikets

I found popular sites to find air tickets:

• Momondo
• Skyscanner
• Kayak
• What else besides Google Flights?

Which one is better for the site about air travel? I want moneymaking with theirs affiliate programs.

I plan to place a banner or widget in the sidebar and integrate partner links into articles.

You can work direct with all airlines if you can prove that you have traffic.