I see what you mean now but don't really understand the logic behind it, how else would somebody get to level 100 without doing LK content? Cold Weather Flying is also taught by all flight trainers and describes what it does so that won't be an issue if on the off chance that somebody actually skipped the entirety of Northrend. Both factions also have Zeppelins/Boats that take you to Borean Tundra so that won't even be an issue either.