190 ops into AY haven't been approved and most likely never will. Check A1 manual only the 170 is approved. Limited Ops into PMQ was approved 6 months back, so I think the 190 has been into there but not AY. Runway length has got nothing to do with it, as AY is longer than PMQ.
Once the 170's go so will AY, PMQ, TL - CS, TL - RK, TL - CG etc unless the turboprops turn up.