Although I missed both departures yesterday evening, it used to be common for a A306 and 722 (or 727-100) flight from BUR in the same evening. Most often the 727's went to AFW. As for last night that is odd to see a FedEx 727 back here but the loads have been pretty good, as a couple weeks ago we had 2 A306 flights to MEM in the same evening. Hope this helps.
On a side note... we had a Gulfstream V just depart BUR, NONSTOP to LFPB (Paris Le Bourget). Long Flight! 10hr 06min. enroute, N775US