I'm confused by so many conflicting searches. Is the Eagle Next open in April? Or between May and Oct?
Per the link by Gunderson,
Opening Dates The Kehlsteinhaus and the Kehlstein bus line are closed.
Reopening beginning/middle of may.
Changes are possible at short notice due to weather conditions.
I don't think the Nest is ever open in April.
It's May of each year that they strive to open, sometimes due to snow, they may open late. I was there the second week of May, 2019 and too much snow on the road to the Kehlstein kept it closed. In the local Berchtesgadener Anzeiger paper an article two weeks ago stated that because of 'lack of snow' the ski area on the Obersalzberg has cancelled the March 16 and 17 Snowboader Race, and the Kehlsteinhaus website mentioned them scheduled to open around the first of May.