There is still one group of cargo transport missions that seem to be thriving and viable in 3.02 and can provide an impressive amount of CR per hour with very little effort required on the pilot's part. All you need is a properly kitted Python and you are ready to roll!
I am referring to "The 120t to 180t Outpost based Boom Time delivery missions"
I am turning one in right now that paid
9,806,508 CR for just over 5 minutes of flight time start to finish.
The title of the mission simply read... "Boom Time Delivery of 180t of Palladium"
The issuing faction was "Dukes of Pira" @ Kuo Port in the Pira System. 11.73Ly from the drop off destination. The mission took less than 6 minutes to complete from departure to delivery.
These particular missions are only offered at Outposts and usually involve delivery to another Outpost or planetary base. They are never offered to ships that require a large landing pad. A medium pad/size ship is required, and due to the 180t cargo capacity required, the Python is the ideal ship for this work.
You can't stack these missions, but considering the "1 Jump" travel distances involved, it is just as fast taking one at a time and then flying Data Delivery or any other transport missions back to the original issuing system where you can pick up another 180t contract.
For anyone interested... The "PIRA" system is located in the Aisling Duval Controlled area of Imperial space, and is one of several systems surrounding the AD home system of Cubeo. Billions can be made relatively easily without the need to travel further than 30 Lightyears in any one direction at any given time. Usually less than 15Ly.