Put on the lion rampants and burst jump. Jump, swing, jump, swing, mashing jump as you are midswing and mashing swing as you are mid jump to conserve as much charge as possible from the boots. You can go like this for awhile across large gaps. When you finally run out you can use Thundercrash (which was also buffed so now you can fly parallel to the ground!), and once that runs out, it resets your lion rampants so you can jump/swing/jump/swing all over again! In the Last Wish raid I made it from the Morgeth checkpoint all the way to the secret chest across the map without touching the ground.

They nerfed sword flying with the last update on swords so you can not just spam the light attack swing as it has a cool down .