What's a good Android app for booking flights that's actually, like, *easy* to use, even if I'm rushing to a conference and need to book ASAP?

Okay, so I'm all about efficiency, right? The Spirit Airlines app actually impressed me. I was expecting a total UI disaster, but the dashboard actually makes sense. I could book a flight and pick my seat faster than it takes to run a regression analysis on my coffee consumption. Seriously, it's statistically satisfying how quickly you can get through the booking process. Plus, the graphs are actually readable! And, get this, it even handles check-in. I haven't dug into the API capabilities yet, but if the rest of the app is this clean, I'm optimistic. Data nerd approved!