Originally Posted by
bob_the_d
If I book a PE seat through LH and on LH ticket stock, the webpages don't specifically say I can use my GPUs to upgrade, but anyone know if it's possible?
Yes,
but if upgraded you'll move to I class (which is the same as for an award ticket) and miles won't post automatically. You'll have to work with United MileagePlus which may be just one mail, or a number of mails (and no success in at least one instance for me so far).