I must first concede this is a ranting post :

In the past few BWs, the DC-9 has simply refused to die, be it in BW1 or BW2 (where the time is set at 2014, 50(!) years after the introduction of DC-9). On the other hand, MD-80 and 90 were out of production for years, if not decades by the beginning of both BWs.
Despite my personal affection for the Diesel 9 (pretty sure AWS too given this fact), the longevity of the Diesel 9 (or rather the brevity of MD-90 production run) have somewhat hampered the choices available to the players, particular in BW1 when C919 and CS not available.
I would be much grateful if it is possible to somewhat artificially lengthen the production run of MD-90 to at least one year after the start of BW1, or better still, swap the love for the Diesel to MD-90s.

This should also partly resolve the complaints other player had regarding the price of 737/320 (or actually, the lack of choice)