Baggage fees for different airlines

Here is a list of the fees that the airlines will charge you for domestic flights within US unless you have achieved certain status in their mileage program.

Airlines	1st Checked Bag	2nd Checked Bag
American	$15	$25
United	None	$25
Delta	None	$25
US Airway	None	$25
Southwest	None	None
Continental	None	$25
Alaska	None	$25
Midwest Express	None	$20