It depends which airline you choose to fly with.
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Southwest is the best airline because consumers do not have to pay baggage fees.
Free baggage allowance
An interline baggage agreement is when airline company X agrees to be responsible to transfer your bags to your next flight on company Y without you having to re-check the baggage between transfer points.
It varies according to which airline. Generally 20-40 per extra bag.
Airline - 2004 Excess Baggage 4 1-21 was released on: USA: 28 June 2004
Airline - 2004 Excess Baggage 6 1-23 was released on: USA: 18 December 2004
Airline - 2004 Excess Baggage 3 1-20 was released on: USA: 13 June 2004
Airline - 2004 Excess Baggage 2 1-19 was released on: USA: 7 June 2004
Airline - 2004 Excess Baggage 1 1-18 was released on: USA: 24 May 2004