 There is no fancy name for when the New York Islanders face the Philadelphia Flyers. Its not a battle of the boroughs or a cross-river rivalry, but when teams are a bus ride apart they play enough to build up some memories. A flight is usually required when the Boston Bruins and Tampa Bay Lightning face off, or meetings between the Colorado Avalanche and Dallas Stars, and the Vegas Golden Knights and Vancouver Canucks. Even though the NHL abandoned its divisional playoff format for one year amid special circumstances, all four second-round matchups pit division rivals against each other with a spot in the conference finals at stake. There is that kind of close, across-town feel, Islanders defenseman Scott Mayfield said. These teams are across the hotel from each other in the Eastern Conferences Toronto and Western Conferences Edmonton bubble, though the familiarity of these foes predates hockeys return. They all have history dating to the regular season and some in previous playoffs, plus Boston-Tampa Bay and Colorado-Dallas are rematches from the seeding round. The Bruins and Lightning fought it out in a one-goal game Aug. 5 and have been the class of the Atlantic Division for years now. The core groups are largely the same from their 2018 postseason meeting. We know each other, Lightning coach Jon Cooper said. I think rivalries, they come organically. You never know who youre going to have one with. But I believe when you play teams in playoffs in recent years, that seems to play into it. We played them a couple years ago, and then weve had some pretty intense games with them since. Usually, theyre one-goal games and usually theres some sort of fireworks that have happened. Colorado and Dallas got about 36 hours notice before starting their series Saturday night, a quick... 