This mission was recently uploaded by Edgar Miller. When I test it, I get into several problems which I think that the mission maker should address.
First, he has forgotten to include the flight plan file (a very common mistake as they are usually stored by FSX in the FSX Documents folder).
Second, the mission requires passing a number of Rectangle Areas in order to trigger the next step, but the instructions are insufficient. At the very beginning, you are not told to which runway you must taxi for take off (34 is the right one). Approaching Pittsburgh, you are also not told on which runway to land (10C it is), and choosing the wrong one will lead to no further triggers operating. The same problem repeats in finding the position to stop for passenger loading, for taking off again, and for landing and taking off at Steubenville. I think the mission should use the Mission Compass and Pointer in order to clear this up.
As a technical point, I also think that for triggering a landing, the use of 'AirportLandingTrigger' is better than relying on rectangle areas which you might miss.
I hope that Edgar reads this, so that we can help improve this promising mission. When starting out in mission making, and indeed all the time, it may be useful to enrol one or several beta testers to verify that the mission works before its is finally uploaded.
Cheers,
eskil