After missing the playoffs just once since joining the NHL, the Golden Knights are in looking like they'll win the Pacific Division. As for the Seattle Kraken, it looks like they are heading to the playoffs in just their second year in existence, and attendance is super strong having the NHL seriously considering expansion.
The Atlanta Thrashers joined the NHL back on June 25th, 1997 and began playing back in the 1999-2000 season. They lasted a decade leaving Atlanta after the 2010-11 season before relocating to Winnipeg and being renamed the Jets.