How far in advance should I book a flight for best price?

Related questions

1. Is it cheaper to book flights after midnight?
2. Do plane tickets get cheaper last minute?
3. Are flights really cheaper on Tuesdays?
4. Do flight prices go up the more you search?
5. Do flight prices drop day of?
6. Why are plane tickets so expensive?
7. Is it cheaper to buy tickets at airport?
8. Will flight tickets go down?

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21. #flight