Southwest is offering double points and double tier qualifying points for travel by May 15.

They were already running double points but had limited the double tier qualifying points to Milwaukee flights. That’s been extended nationwide. (If you had already registered for either promotion, you’re already registered for this. Otherwise, iregister.)

One change since the original promotion was first rolled out is that since February 14, only flights booked “through Southwest channels” are eligible for these promotions. Most Southwest flights are, to a greater extent than with the legacy carriers, so when I saw it I wasn’t especially concerned. Southwest’s website was one of the very first to hit a billion dollars in sales in a year — not one of the first airlines, one of the very first websites period. They’ve long marketed their flights directly with only limited participation in third party distribution systems. (Their Airtran subsidiary is a different matter.)

Hat tip Robert G.