Airline

Allowance

Max wt per piece

Max size per piece

AirTran

3

$50 per extra piece

70lbs

$65 per piece if oversize or overweight

62"

$65 per piece if oversize or overweight

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

Under 62"

America West

2

50lbs

$50 if 51-70lbs
$80 if 71-100lbs

Under 62"

$80 if 63"-80"

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"

$80 for up to 115" in addition to overweight and/or extra piece charges

ATA

2

50lbs

Note max wt for all luggage of 44lbs on trans-Atlantic flights

62"

Continental

2
3 for First class

$80 per extra piece

50lbs
70lbs for First class and OnePass Elite

$25 if 51-70lbs
$50 if 71-100lbs

62"

$80 for oversize

Delta

2

1 extra piece @ $40
2-3 extra pieces @ $80 each

4-6 extra pieces @ $105 each

7+ @ $180 each

50lbs

$25 if 51-70lbs
$80 if 71-100lbs

62"

$80 for 62"-80"

Max oversize is 80"

Frontier

2

$50 per extra piece

50lbs

Max wt 100lbs, no info on charges

62"

No info on oversize charges

Max oversize is 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"

$25 for an oversize piece inter-island, $80 between HI and the mainland, $105 between HI and the South Pacific.

Max oversize is 80"

JetBlue

3

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
3 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

50lbs

$25 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

50lbs

100lbs max wt

62"

Max oversize is 115" with no more than 72" in any dimension