Out of a gameplay standpoint all the DC-9 prices seem fairly rediculous. The 10 and 20 are very overpriced. Given thier utility, which is between the caravelle and the 737. Some Caravelles match the DC-9s performance and are much cheeper, which is odd. The DC-9-30 is definatly a 737 competator, but its range is greatly inferior. The DC-9-40 is about right, though its range still sucks.
Ill also compain about the price hike on the 727-200, its performance just isnt worth that price. It was better where it was before it was changed. The 727-100 also is highly overpriced. Variants of the trident outperform it in every way, inludeing fuel effeciancy. This is not only counter intiutive, it is also unrealistic, the trident was known as a gas guzzeler, and the region it never sold well was because it couldnt match the 727 variants in performance.
Its just a wierd system at the moment. could i please simply request fewer nerfs?