Mr. DM of Trans North in the Yukon is one of the highest time mountain pilots in Canada. He received an award this year from HAI.
There, he told me a story of how he was attempting to put sling loads at 19,200 ft with a 350B2, but could not. He came back with a 206BIII and completed the job.
Shawn, you know our friend Mr. AR from BHTC - his Himalayan rescue of a Pakistani Lama crew from approx 21K in an L4 is one of the highest ever. He left the crash site with 5 souls and 300 lbs of fuel if I remember correctly.
BV