Here's the link from US's website. *A silver baggage benefits can vary by airline. Baggage fees are per person, btw, so it is unless your companions are statused on *A they'll be billed for baggage
http://www.usairways.com/en-US/trave...epolicies.html
Exempt from 1st and 2nd checked bag fee
Overweight/oversize fees may still apply (see overweight/oversize tab)
All Dividend Miles Preferred members
Confirmed First Class and Envoy passengers
Active U.S. military on personal travel*
Active U.S. military with ID and dependents traveling with them on orders (1st through 4th bags up to 100 lbs/45 kg each free of charge)*
Unaccompanied minors (with US Airways unaccompanied minor paid assistance)
Passengers traveling to/from the Middle East or South America
Star Alliance Silver and Gold status members
Golf items are specifically addressed here:
http://shopping.usairways.com/en-US/...cialitems.html
Golf equipment
Golf equipment will be accepted in the normal baggage allowance in lieu of a piece of baggage. A pull cart may be included if it is attached to a golf bag. Golf equipment should be enclosed with a cover to prevent loss of contents. Hard sided carriers are recommended. One item of golf equipment consists of:
1 golf bag, containing no more than 14 golf clubs
12 golf balls
1 pair of golf shoes