United Airlines - Promotions: Air. These folks run an amazing number of promotions, but in order to participate, like a robot, you have to go to the promitoin site and sign up.
So check there every so often. Big ones are win a million miles if you fly once. If you fly inside Asia, get 25,000 miles. If you fly from Denver get miles,etc.
And to me quite important. United, ADRIA Airways, Air Canada, Air New Zealand, ANA, Asiana, Austrian Airlines Group, BLUE1 Air Botnia, bmi, CROATIA Airlines, LOT, Lufthansa, SAS, Singapore Airlines, Spanair, TAP Portgual, THAI, US Airways and Varig. Now the flight miles you earn on all paid, qualifying Star Alliance member-operated flights count toward your Mileage Plus® Premier, Premier Executive® or 1K® membership status.
So in particular, if you fly SAS to Europe or Singapore Air or US Air, it counts as elite qualifying miles.