For one day only, JetBlue is selling last-minute flights for as little as $10 each way. The $10 fare is only for trips between Boston and Buffalo this weekend (departing on Saturday, returning on Tuesday or Wednesday). There are sale prices with similar departure restrictions on routes such as Boston-Chicago (from $59), Fort Lauderdale to Austin ($69), and New York to Seattle ($89). Tickets must be purchased by 6 p.m. ET on April 27. More details here.