The estimated field size is 144. competitors split evenly into two flights of play; Open
Open Flight participants will compete using raw scores. Performance Flight participants will compete using the Performance Scoring™ system provided by Disc Golf United™.
Each flight will consist of 72 players. Peformance Flight
All Performance Flight candidates and participants must have a PDGA Player Rating of 875 or higher,
and must have a minimum of 12 PDGA Rated rounds between November 1, 2011 and October 1, 2012.
So, it's just a way to integrate AMs into the mix, IMO. It's an XM-tier event instead of just a "Major" --- whatever that means. Out of the 72 listed for "Performance Flight" only 3 contestants were over 1000 rating. I dont think there would be two champions for the USDGC, its just the same as saying "I won my xxxx Division at so and so tourney" Gets interest generated for the USDGC and probably brings the city/tourney in just a little more money. Entry to the Performance Flight is only $100 compared to $225..
The scoring is somewhat wonky, and lets just hope they never use only the performance scoring again. I believe the two types of scoring should always be split up.