Dalvin was still at the head of the level 4 flying boat while it sped across the land, no longer cultivating as they were already aware of their destination. While the Great Void World was large, it was only about as big as Earth, where the distance between where they currently were and where they were headed was like going from America to Italy.
That was about 9,000 kilometers of distance, but for the level 4 flying boat that moved at 2,500km/h, it took only 3 hours of nonstop movement to reach their destination.
Naturally, they did not appear right above the battlefield but slowed down the flying boat a few miles away where the human defense fortifications were built. This was the Martial Defense Frontier, the holy land of heroes and martyrs in the Great Void World.