According to Cranky Flier, AA's adding Fort Lauderdale to Boston, New York JFK, and Los Angeles.
Just yesterday, JetBlue added Miami to Boston, New York JFK, and Los Angeles (and Newark). AA was quick to respond.
Additionally, AA's adding a daily Dallas/Fort Worth to Long Beach on the E-175 starting April. Last week, Southwest added DAL-LGB in its schedule extension.
These routes currently aren't available for booking, but they should open over the weekend.