Per airliners.net:
DL cut LAX-FLL but they had not yet loaded LAX-MIA. The LAX-MIA flight is now on DL's desktop timetable. It's the same flight number and flight time as LAX-FLL so it really is a straight switch. It starts June 9th.
LAX 2240 MIA 0646 Daily 73H
MIA 0745 LAX 0959 Daily 73H
http://www.airliners.net/aviation-fo....main/5075423/
I don't think one 73H will be much of a threat up against AA's 7 frequencies on larger 757, 763, and 777 aircraft that are better timed for connecting and O&D traffic.