[SORRY FOR THE DOUBLE POST, first seemed to be stuck with moderation]
Hi, and let me thank for all your experience in my first post.

What is a reasonable price for the upgrades to the business in Atlantic flights? LOT is currently proposing me one from EWR to WAW on Tuesday from class L to business, with bids starting at 665 USD (after the 5% discount).

I don't know that seats availability but comparing with prices in my prev bids it seems that the premium economy is more filled than business.