American brings back double elite qualifying miles through December 15 — the second time this year — REGISTER HERE.
United followed suit and announced the same thing today, Registration required for your choice of double qualifying miles or double qualifying segments, you have to pick and you can only choose one.
Elite Qualifying Miles (EQM) do not get you free flights but when you have enough you will get status with the Airline which entitles you to all kinds of perks! :)