I don't understand the delta.com "Upgrade & Standby List." I'm flying SAT-ATL-JFK-transatlantic tomorrow. For SAT-ATL, delta.com indicates that there are three available seats in first, and "3 passengers on Upgrade List. Check with agent for priority." For ATL-JFK, delta.com indicates that there are also three available seats in first and that I am " #1 of 3 on Upgrade List." Why the precision with the latter, but the useless "Check with agent for priority" as to the former?