If the aircraft is indeed still in an all-Business Class config, then that may very well be the reason. Too few Business Class bookings. I'm sure the aircraft will be back in the skies during the winter schedule if the global economy continues to improve. Perhaps MUC-BOS, which was often a Privatair route in the past, will get it again if loads don't look good enough. Either that or LH will think of something else or the aircraft will be reconfigured with a C/Y configuration like the other Privatair birds currently flying for LH.
sounds like a wetlease. So is KL receiving money for it ?
All the PrivatAir operations are wetleases. The airline (KL/LH/LX) gets all the revenue from the tickets sold and pays whatever fee they have negotiated with PrivatAir to operate the aircraft, plus fuel and catering expenses etc.
Thanks for the quick answers!
Isn't it cheaper for KL to order their own B737-700
who can do the same flights ?
While KL does operate their own 737-700s, the one used by PrivatAir on the AMS-IAH-AMS route is a BBJ with several additional fuel tanks in the cargo/baggage compartment and other structural differences of the BBJ. I doubt it would make sense for KL to own a single BBJ themselves for that type of specialized operation.
It must be profitable for KL as it's been operating almost 5 years. That BBJ must achieve among the highest utilization figures (but the fewest cycles) of almost any 737 flying. It's in the air over 20 hours a day and covers 8,712 nm six days a week (except Wednesday). Block time AMS-IAH 10 hr. 40 min, and IAH-AMS 9 hr. 50 min.