How do you get the Airline Pilot achievement?

[Awaken]

As the title says, how would one go about getting the Airline Pilot achievement?

I've almost finished the campaign, and have pretty much gotten all the other achievements. Just this one achievement I'm not sure how to get. Will the last two places offer a location to jump for achieveing this?

To my surprise, this game is pretty fun. Been playing it with my old Logitech Rumblepad 2 wired controller, and seems to play just fine. Short, but fun.

[Awaken]

Alright, figured out how to get it. In the badlands map, I just kept going over the small cliff near the human settlement.

It's 15 seconds accumulated over the entire level. Not 15 seconds in one go. Man I love the bonus levels gameplay.