big missing airliner for four weeks with all this looking it s hard to believe. it is not, however, unprecedented. again here s kyung lah. reporter: frustration mounts as the search continues for malaysia airlines flight 370. but look back through aviation history, and there are other mysteries that linger for months, years, even decades. there have been planes in the past that have completely disappeared. carroll gray is an aviation historian. he says the most storied and enduring mystery is the disappearance of amelia earhart. she vanished over the ocean in 1937 as she attempted to fly around the globe. there s still no concrete evidence as to what happened. reporter: her mystery unsolved. for a passenger plane like that to disappear, that s not unprecedented, either. no. and one that comes to mind is the british south american airways.
mysteries that linger for months, years, even decades. there have been planes in the past that have completely disappeared. carroll gray is an aviation historian. he says the most storied and enduring mystery is the disappearance of amelia earhart. she vanished over the ocean in 1937 as she attempted to fly around the globe. there s still no concrete evidence as to what happened. reporter: her mystery unsolved. for a passenger plane like that to disappear, that s not unprecedented, either. no. and one that comes to mind is the british south american airways. reporter: two british south american airways jets and their 51 passengers disappeared in the infamous bermuda triangle in the 1940s. also that decade, five american bombers on a training mission vanished in the bermudas. even the search plane went missing all without a trace and still unsolved. then there s this, the flying tiger line. it went off in 1952 near
reporter: frustration mounts as the search continues for malaysia airlines flight 370. but look back through aviation history, and there are other mysteries that linger for months, years, even decades. there have been planes in the past that have completely disappeared. carroll gray is an aviation historian. he says the most storied and enduring mystery is the disappearance of amelia earhart. she vanished over the ocean in 1937 as she attempted to fly around the globe. there s still no concrete evidence as to what happened. reporter: her mystery unsolved. for a passenger plane like that to disappear, that s not unprecedented, either. no. and one that comes to mind is the british south american airways. reporter: two british south american airways jets and their 51 paebssengers disappeared in e infamous bermuda triangle in the
flown for four or five hours after losing contact with the ground. at the site of its last contact with the ground, it then changed direction. that s where you re getting the pointing arrow. off-base from its scheduled route into the indian ocean. is it possible that this plane may never be found? it has happened dozens of times over the years. kyung lah is outfront. reporter: look back through aviation history, and there are other mysteries that linger for months, years, even decades. there have been planes that disappeared. carroll gray is an air flight