I have been checking my itinerary for a trip this weekend (dca-atl-las-cvg-dca) departing Saturday and I noticed this status, "available", on the second segment. All others show "request only". The text for "available" reads as, "You are within the upgrade window and seats in the upgraded class are available for this flight". I have never seen this status before. I hope it soon becomes "confirmed". Is this something new?