Also when you fly >100k miles/yr on UA you get six systemwide upgrades you can use on any int'l flight as long as w fare or higher, and 2 US/Canada/mexico (CR-1s) confirmable upgrade instruments per quarter if you fly 10k miles on UA in that quarter, and I believe 6 CR-1s per year to begin with. US is aweful, and unless flying premium cabin LH will not give you full miles. LH will be best if all you fly is premium cabin pd flights (F,A,P,C,D,Z)