Stunning Happenings of World War II

The scenario involves a young couple from the 60s, 70s or 80s who claims to have seen a vintage model crossing the skies at low altitudes - sometimes even a group of them. Some of these stories are well-founded: the plane disappears into the air, the appearance was an omen of an accident that occurred shortly afterward, the pilots nod sadly to the spectators below etc. Some reports involve speculation about "time slots."