i struggle what to pick for economy as i'm tall, but also being able to lean on the plane can be nice. i definitely haven't done a middle longer than 2h anywhere in a very long time. 9h is rough trying to avoid both your neighbors
$180 for premium seems worth it every time, i pretty much never see it that low.
just priced out bkk-sfo one way, same day starlux is 636 economy, 1071 premium economy
tun-ord exactly same luft united through fra in econ/premium/biz is 537/1032/1224
usually the gap between any economy and biz is bigger, but i am surprised to see this jump from economy to premium which is typical. i can't justify it at this price difference unless it is nicer, it does seem like they are generally working on making it nicer though.
as an aside the cheapest star alliance business flight w/1 stop may 6 is fra-lis-ord for $1509, the nonstop united fra-ord is $5821. flying tun-fra-ord though - on the exact same united plane - is $1188. 2h economy flight fra-tun is $300. would i fly to tunis so that my biz flight earns biz miles and is confirmed for a $4700 price break..?
i will be in december for my christmas trip home, going to athens/tunis then home for the holidays. i have a tunis roundtrip to ohare for christmas, then a tunis to my thai island trip both booked.
by my calculations this part of my christmas trip will cost me $2749 and valuing chase and alaska miles i'll earn at 2 cents apiece, will result in $2036 worth of points, and flying 22k miles in business class. at the end of the year i'm going to see if anyone on reddit or flyertalk got to top tier status for cheaper than me.