Domestic Travel (within the U.S./Canada, Mexico and the Caribbean) Coach Class: For tickets purchased on/after July 10, 2008 for travel on/after August 28, 2008, each ticketed passenger is allowed one (1) piece of checked luggage for a fee of USD $15 each-way and a second pieced of checked luggage for a fee of USD $25 each-way. Third and subsequent pieces will be assessed a fee of USD $100 per piece each-way. * Each piece: 50 pounds (23 kg) with linear dimensions not to exceed 62 inches (158 cm). * Northwest Airlines' Silver, Gold and Platinum WorldPerksÂ® Elite customers, SkyTeam Elite customers and passengers booked in full fare classes (Y or B) may check two bags free of charge. Customers seated in First Class may check up to three bags free of charge. Luggage in excess of these special free allowances will be charged a fee of $100 per piece each-way. * First Class: Each ticketed passenger is allowed three (3) checked pieces. o First two (2) pieces: 70 pounds (32 kg) with linear dimensions not to exceed 62 inches (158 cm) per piece. o Third piece: 40 pounds (18 kg) with linear dimensions not to exceed 45 inches (115 cm). Note: The same checked luggage allowance applies to children and infants paying at least 50% of the adult fare. Infants traveling free of charge are permitted one (1) carry-on diaper bag, free of charge.