Four canine trespassers managed to sneak into Tokyo’s Haneda Airport yesterday, giving themselves the run of the place and making life ruff for pilots, The Asahi Shimbun reports.

The pack, which started out with four dogs, has disrupted 18 flights so far. Some planes were left circling in the air for a while, while others had to go land at different airports. Officials are confused as to how the dogs got through their ten-foot sensor-equipped fences. “We have never heard before of dog intrusions at airports,” one said.

As of six hours ago, three of the dogs had been captured, and transport ministry staff were going after the lone holdout. Video footage from the Associated Press shows the last pooch running through the tall grass, trotting down the runway, enjoying the ocean views, and easily avoiding the officials’ slow-moving vans.

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