What is the best day to buy cheap airline tickets?

Related questions

1. What does Trivago mean in English?
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Tags

1. #deals
2. #monday
3. #announcing
4. #according
5. #match
6. #earlier
7. #other
8. #those
9. #apparently
10. #cheapest
11. #flights
12. #trying
13. #mentioned
14. #internet
15. #tuesday
16. #evenings
17. #airlines