“In April 1966, the U.S. Army OH-6A, which would later win accolades for its performance as a scout helicopter in Vietnam, set 23 world records for distance, speed, and altitude; more than four decades later, many are unsurpassed. Perhaps the most incredible of these unbroken records is the longest nonstop, unrefueled flight by any helicopter…”
Moments and Milestones: Now, That’s Good Mileage by Don Porter – Air & Space Magazine, May 01, 2011
We could have flown all day!!
(Of course, no Observer. And we would have burned all night, if shot down. I think the way we did it was better for survival.)