For most airlines the biggest cost is fuel, they reliably make the money back on the planes themselves because they run them for 30 years, so it's a long-term investment but it will pay off.

Over the 30 years this aircraft could theoretically be in operation fuel costs are going to skyrocket. So not only is it saving some money today, it's saving a lot of money tomorrow. We may even get to the point where aviation fuel becomes literally unavailable, an electric aircraft like this is a pretty good insurance policy. But you do have to buy a whole new aircraft, and maybe you've still got 20 years on your current one, so you need to make that money back, and one of the best ways to ensure that you pay off that cost is to have more customers, and the best way to have more customers is to have cheap fairs. You can afford cheap affairs because you'll feel costs a lower.