Should you have a hankering to go to Detroit, you know, midwinter and all, Spirit Airlines is selling $0.05 one-way fares (based on a round-trip purchase, of course!). These very special prices are available on departures from LaGuardia on Feb. 21, 24, 27 and Mar. 6. Just so you know. Book by tomorrow. Details and a boatload of fine print here. And don’t worry – there are plenty of places you can get to from Detroit that aren’t Detroit – that’s one of the airline’s two hubs (for those of you keeping score at home, the other’s in Fort Lauderdale, and no, it will not be possible for you to fly there for a nickel.)