One-day sales, Dec. 20 only

Both United Airlines and Carnival Cruises have launched one-day sales for future travel. The catch: You must book today.

EUROPE, MIDDLE EAST: United is offering sale prices to Europe and the Middle East for travel between Jan. 9 and March 31. Today's sale offers a 10 percent discount over regular fares. You must book by midnight, Dec. 20. Book online at www.united.com and get 1,000 bonus miles.

CARIBBEAN ON CARNIVAL: Book today for special cruise fares on three, four and five-day cruises aboard Carnival, with prices starting at $179 per person, double occupancy, on specific sailings.