Thank you
Jambo Buana, it's nice to be right once in a while.
Actually,
hetfield's post reminded me of past Airbus days, where, indeed, Flap and Slat operation was not permitted above 20,000 feet, but, for a positioning flight with Slats or Kreuger extended, data was available up to 30000 feet, where, in addition to the CAS limit, a Mach Number limit now also applied.
Now I wonder why that might be ?
Regards,
Old Smokey