Are there any advantages of upgrading directly (via fixed price) instead of with the plus upgrade?
other than obviously the guarantee that you will fly the upgraded class…
No difference… and always bid minimum, if there are spots you will be automatically winner. I am biding for years now.
And just to let you all know, if you bidding with LOT price go down by 15% 4 days before departure, and it’s automatically accepted in 48 hours before departure.