If traveling with your bike and shopping airfares, definitely consider the cost to ship your bike as part of your overall ticket price. Delta is one of the most bike UNfriendly airlines. Most other carriers are charging $100 or less to ship a bike round trip (a few years back it was free). Delta charges $175 for domestic U.S. travel and a whopping $300 for international travel.
With the baggage fees increasing, travelers are checking less and carrying-on more. That should mean more room in the belly of the plane.