Qatar Airways has their first major seat sale of 2020 for most of their flights Worldwide. On top of the discounted fares they are also offering double QMiles on all cabins as long as you register for the bonus miles offer. Flights need to be booked by January 12 (for Asia residents) or January 13 (For Americas and Europe) for travel until December 10, 2020.
Use this link if you live in North or South America or Europe to register for the double miles and take advantage of the sale
Use this link if you live in Asia or the South Pacific to register for the double miles and take advantage of the sale