Maybe, if it meets certain dimensional and weight requirements, otherwise, $150 with certain restrictions.
http://www.aa.com/i18n/travel-info/b...and-sports.jsp
You’ll be charged $150 unless your bike and case are less than 62 inches and under 50 lbs. If so, they’ll be considered as your 1st checked bag. You can travel with 1 non-motorized touring or racing bike if the:
- Bike is in a hard-sided case, bike bag or box built for bike transport
- Handlebars are fixed sideways
- Pedals are removed; or
- Pedals and handlebars are wrapped in plastic foam or a similar material
Please note that if your bike is not in a hard-sided case, it will be treated as a fragile item.
Maximum weight and size
70 lbs. and 126 inches based on the airplane size and load factors