Or...........................go to the site and read under FAQs.
http://www.delta.com/travel/trav_serv/bag_info/carry_on/index.jsp
Domestic U.S. Baggage Allowances
Beginning August 15, 2002 on domestic flights, Delta accepts a maximum of two checked baggage items free of charge for each ticketed passenger, in addition to the one carry-on, plus one personal item.
Check two bags and carry on one bag, plus one personal item
Additional baggage may be accepted for an excess baggage fee. All baggage must meet the size and weight limits. Luggage carts count toward your bag allowance.
We may limit the amount of excess baggage when such excess prevents us from carrying each traveler's free baggage allowance.
Personal items
In addition to the one carry-on item, you can still bring one personal item such as:
a male or female purse
a briefcase
a computer bag
a camera case
a diaper bag
or items of a similar size
Additional items
The following may be brought in addition to what is listed above and does not count towards your allowance:
food item for immediate consumption
assistive devices such as wheelchairs or crutches, provided passenger is dependent on them
one box or bag of duty free
child restraint device
coat jacket
umbrella
one item of reading material