This may be the most generous credit card offer yet.

No, it isn’t the 25,000 mile bonus that Northwest offered last summer — but you had to wait 15 months for all the miles to show up.

And it isn’t the 25,000 mile bonus that Delta has been offering at times — but you had to spend tens of thousands of dollars before all the miles showed up.

This offer is simple. Use the $60 annual fee card once and pocket 20,000 United miles.

Very bold… especially since the consensus seems to be that United is turning a corner financially with labor concessions in place and the impact of the war on Iraq being somewhat less than expected.