There’s nothing Alaska Airlines pilots like more than a challenge. As a company that started out flying between remote airfields deep in the Alaskan “bush,” safely navigating where other airlines can’t is in Alaska’s blood.

So, for Alaska, putting a flight in the path of the Great American Eclipse wasn’t really a question of if, but how.

Total solar eclipses aren’t rare – they come around every 16 months or so. Being lucky enough to get in their path is the hard part. Diehard eclipse chasers, called “umbraphiles,” go to drastic lengths to put themselves in the moon’s shadow. They plan years in advance, strategically choosing the best places to catch each and every eclipse, whether that means scaling a mountain, chartering an Arctic voyage… or planning an incredibly complicated flight path.

The math problem goes something like this: A plane leaves Portland flying 500 mph to catch a solar eclipse as the moon’s shadow decelerates from infinity in the instant it touches the Earth to approximately 2,400 mph approaching the coast of Oregon. Where in space and time does the plane need to be to give guests the ultimate eclipse experience?

It’s the kind of equation that takes a team of astronomers and aviators to crack.