The quiet period for most airlines is after the New Year. During the first quarter there are often good air miles deals if you wait till the end of January before booking.
British Airways has offered triple air miles over the last few years for flights in February and March. Virgin Airlines also follows up with air mile offers of a similar magnitude.
If you can hold back that flight until the offers come through; it is a time of year to feast on the air mile opportunities available!

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