Searching for J seat maps in Q1 2015 for AA153 ORD-NRT. Some of the maps are returning maps no problems. Others through up the following message :"There was an error message from the airline when trying to retrieve this seat map: DTE"

Any thoughts on what DTE is? Also saw a message about an equipment change on the same route for 25 Feb 2015 but can't reproduce that same result.