quote "mix of 70 seat turboprops (DH4)"
I dont think the 400 would be a good bet,look at the problems JSY have had with them,the way to go is single fleet so just stick with the 19,20 maybe even an 18 but not TP's,the diamond ideas have already beeen forwarded to the management but no reply has been made,prob dont want to be seen to have made mistakes
rgds
K.I.L.