I read it as 3000 miles for an InsideFlyer sub if you pay with your UA Visa. Otherwise, it's 1500 miles.

And, if you pay with your UA Visa and have registered for their double miles offer, you get double miles on the purchase price (120 miles instead of 60 miles).

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"Would you convey my compliments to the purist who reads your proofs and tell him or her that I write in a sort of broken-down patois which is something like the way a Swiss waiter talks, and that when I split an
infinitive, d*** it, I split it so that it will stay split."
- Raymond Chandler, to the editor of the Atlantic Monthly, 1947

More Room Throughout Coach: the Website of Free Miles and Free Markets