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From Pathfinder Lost Omens The Grand Bazaar, which isn't enabled.

Skyrider Sword

ITEM 14
UNCOMMONAIRMAGICALVERSATILE-P
Price 4500 gp
Usage held in 2 hands
Bulk 2
Category martial
Group sword
Damage 1d12 slashing

This +2 greater striking shock greatsword has a broad, flat blade that can support the weight of a Medium-sized or smaller wielder. Magic allows the weapon to soar through the air, carrying its wielder along with it.

Activate command
Frequency once per day
Requirements You're holding the sword in at least one hand
Effect You leap upon your sword as it soars through the air for up to 10 minutes. You gain a fly Speed of 25 feet or your land Speed, whichever is slower, but you can't Strike with your weapon except via the weapon's other activation (see below). You can Dismiss the activation, and it ends automatically if you cease holding the weapon with at least one hand.

Effect: Skyrider Sword

Activate Interact
Requirements You are riding on your weapon
Effect You ride your weapon into a foe, attacking it as you fly past. You Fly, making a melee Strike with the weapon once at any point during your movement.
Pathfinder Lost Omens The Grand BazaarOGL