York scored the go-ahead goal 2:24 into the third period, less than a minute after Gagne tied it off an assist from Peter Forsberg.
York’s goal was the subject of a lengthy review while officials confirmed his stick wasn’t too high when he took an awkward bunt-like swing, hitting the puck off the shaft of his stick into the net.
Jeff Carter’s short-handed goal on a breakaway with about 6 minutes left pushed the lead to 4-2. With 1:04 left and Atlanta goalie Kari Lehtonen watching from the bench, Alexei Zhitnik added an empty-net goal.
Antero Nittymaki stopped 32 shots, allowing only one goal, to move to 6-0 against Atlanta with his second win over the Thrashers in a week. Nittymaki led the Flyers to a 2-1 win in Atlanta last Sunday.
Flyers coach John Stevens opened the game with Robert Esche in net – but only for a few minutes while Nittymaki worked out a stiff neck.
Carter’s goal came less than 30 seconds after Forsberg’s slashing penalty. The Thrashers couldn’t score with the man advantage, leaving them without a power-play goal in six of their last seven games. They were 0-for-4 on the power play in the game.
Philadelphia, last in the NHL with 33 points, moved to 8-0-1 against Atlanta since its last loss to the Thrashers on Dec. 21, 2003.
The Flyers took a 1-0 lead only 2:41 into the game when Dimitry Afanasenkov took advantage of the opening left when Lehtonen was slow recovering after leaving the net. Afanasenkov took a pass from Todd Fedoruk and scored from the high slot – his second goal in two games.
Esche faced only five shots, allowing Ilya Kovalchuk’s breakaway goal 3:36 into the game, before he was lifted for Nittymaki 6:59 into the game with the score 1-1.
Jim Slater gave Atlanta a 2-1 lead 3:37 into the second period with his fifth goal, but Nittymaki shut out the Thrashers the rest of the way.
Notes: RW Darren Haydar, signed from AHL Chicago on Friday when J.P. Vigier was placed on injured reserve with a groin injury, saw his first playing time for Atlanta. Haydar was leading the AHL with 89 points. … Kovalchuk’s goal was his 30th of the season. … The Thrashers drew only one penalty, a hooking minor on Shane Hnidy 15:48 into the second period. … The game was Atlanta’s sixth sellout of the season.