There was always a rumour of AB launching services to NCL, it could be from any one of their bases, more than likely TXL, MUC or Paderborn??? Dash 8 could be an ideal aircraft, certainly LH seem to fill a small regional airliner from DUS, though I suppose many pax could use these flights for onwards? There is definately scope for regional services to Germany from NCL, past history may not do us any favours with SXF, HAM, MUC, CGN all dropped by previous operators.
Even though PIA is a nice thought for some and probably a welcome addition to the management, I think I must agree with a comment earlier - lets drop it. The market would be very weak even on a bi weekly frequency and its probably a no go on behalf of PIA. They may have looked, one can always be surprised!
757 speedbrakes I could be wrong but do PK not use A310 into Glasgow?