One of the great airline marketing gimmicks is going away: Delta used to guarantee any customer who showed up a seat on its DC-NY-Boston shuttle. If one couldn’t be provided within 30 minutes of the next departure, the customer received a free shuttle ticket. This harkens back, I think, to the old gimmick when Eastern ran the shuttle and said they kept an extra plane onhand in case one shuttle was full. In any case, Delta is eliminating the guarantee policy. This will have virtually no affect on anyone (US Airways also runs a shuttle, so seats are available every 30 minutes), but it was nice to know it was there. Oh well.