With schools and businesses closed, conferences and conventions canceled, and travel restrictions in effect, very few of us are flying anywhere at the moment. States and countries are already slowly starting to bring themselves back online, though, and eventually, travel with pick up again—at least, to some degree.

But commercial airplanes tend to be essentially airborne sardine cans, in which germ-filled passengers are packed horrifyingly close together, all breathing the same recirculated air. For those who do have to travel, or who are planning to in the rest of 2020, prudence seems advisable. Passengers should wear masks, and airlines can help keep spacing between them by reducing capacity and leaving narrow, overcrowded seats empty for the time being.

No two airlines are handling the uncertain future in quite the same way. Frontier Airlines, though, is going all in on the industry’s worst nickel-and-diming impulses and is happy to let you gain a few precious inches of space from your neighbor and their bodily fluids—for an additional fee.