Airline checked luggage policies

Airline	Allowance	Max wt per piece	Max size per piece
AirTran	2 $50 per extra piece	50lbs $25 if 51-70lbs $65 if 71-100lbs	62" $65 per piece if oversize up to a max of 80"
Alaska (and also Horizon)	2	50lbs $25 if 51-70lbs $50 if 71-100lbs Either extra weight or extra piece charge applies (whichever is greater) but not both	Under 63" $50 if 63"-80" $75 if 81"-115" Either extra weight or extra piece charge applies (whichever is greater) but not both
Aloha	2	50lbs fee charged for bags over 50lbs, max wt is 70lbs per bag	Under 62"
American	2 1-3 extra pieces @ $80 each 4-6 extra pieces @ $105 each 7+ @ $180 each	50lbs on both domestic and international flights $25 if 51-70lbs $50 if 71-100lbs	under 62" $100 for up to 115" in addition to overweight and/or extra piece charges
ATA	2 on intl flights 3 on domestic	50lbs Note max wt for all luggage of 44lbs on charter flights	62"
Continental	2 3 for First class 1-3 extra pieces @ $80 each 4-6 extra pieces @ $105 each 7+ @ $180 each	50lbs 70lbs for First class and OnePass Elite $25 if 51-70lbs $50 if 71-100lbs	62" $80 for oversize, max size of 115"
Delta	2 Extra bags at $50 each domestically, $100 internationally	50lbs $25 if 51-70lbs $100 if 71-100lbs	62" $100 for 62"-80" Max oversize is 80"
Frontier	2 $50 per extra piece	50lbs $50 for up to 100lbs	62" $50 for up to 80"
Hawaiian	2 1-3 extra pieces @ $80 4-6 extra pieces @ $105 7+ @ $180 each $25 per extra piece on interisland flights	50lbs $25 if 51-70lbs Over 70lbs not accepted	62" 'The charge for an oversized bag may depend on what you're transporting'. Max oversize is 80"
JetBlue	2	70lbs $50 if 71-100lbs If both overweight and oversize, both fees apply	62" $50 for 62"-80" Max oversize is 80" If both overweight and oversize, both fees apply
Northwest	2 @ 50lbs 2 @ 70lbs + 1 @ 40lbs for First class 1-3 extra pieces @ $80 each 4-6 @ $105 each 7+ @ $180 each	50lbs $25 if 51-70lbs $50 if 71-100lbs	62" $80 for 63"-160"
Southwest	3 4-9 extra pieces at $50 each 10+ @ $110 each	50lbs $25 if 51-70lbs $50 for 71-100lbs	62" $50 for oversize Max oversize is 80"
Spirit	2 Extra pieces $50 each	70lbs $50 if 71-100lbs	1st piece max 62" 2nd piece max 55" $50 for oversize up to 160" Max oversize is 160" with no more than 80" in any dimension
United	2 3 for 1K Premier Executive, Premier Executive and Star Alliance Gold members     $80 for each extra piece 1-2 extra pieces @ $85 each 3-4 @ $125 each 5+ @ $200 each	50lbs possibly 70lbs for 1K Premier Executive, Premier Executive and Star Alliance Gold members $50 if 51-99lbs If both overweight and oversize, both fees apply	62" $80 for up to 115" If both overweight and oversize, both fees apply
US Airways	2 1-7 extra pieces @ $80 each	50lbs $50 if 51-70lbs $80 if 71-100lbs 100lbs max wt	62" Max oversize is 115" with no more than 72" in any dimension