Originally Posted by sdsearch

The card earns 2x on everything!

So from a dollar perspective, it's 1 dollar equals 2 Arrival miles, while 1.7 Arrival miles equals 1 airline mile. So therefore 0.7 dollars (1.4/2) equals 1 airline mile, or 0.85 dollars (1.7/2) equal 1 airline mile.

Thus it's 1.4:1 or 1.7:1 going from Arrival miles to airline miles, but it's 0.7:1 or 8.85:1 going from dollars (through Arrival miles) to airline miles.

I'm very familiar with this convoluted arithmetic because Diners Club USA,well over a decade ago (during the Citi days), also used to earn 2 points per dollars and then require 2 points per airline miles, but that equated to 1 airline miles per dollar spent.