Originally Posted by
waxearwings
Incorrect.
TK does NOT credit its cheapest classes, and like in the LOT chart, simply puts them in the "All other fare classes do not accrue mileage" bin. You can see which classes stopped earning miles by scrolling down to the 2012 chart
Are you sure those aren't simply outdated fare classes? I booked a couple of tickets at very low prices on TK recently, and ended up in fare class Q -- which earns full credit on UA -- without even meaning to.
My point is not that you're incorrect, but just that some of the very cheapest seats TK is selling do seem to earn UA miles. Regardless, always good to have another data point!