Since 1926, there have been doubts raised, defenses made, and heated controversy over whether or not Byrd actually reached the North Pole.
In 1958, Norwegian-American aviator and explorer Bernt Balchen cast doubt on Byrd's claim on the basis of his knowledge of the airplane's speed.
Balchen claimed that Bennett had confessed to him months after the flight that he and Byrd had not reached the pole.
Bennett died on April 25, 1928, during a flight to rescue downed aviators in Greenland.
However, Bennett had started a memoir, given numerous interviews, and wrote an article for an aviation magazine about the flight before his death that all confirmed Byrd's version of the flight.

The 1996 release of Byrd's diary of the May 9, 1926 flight revealed erased (but still legible) sextant sights that sharply differ with Byrd's later June 22 typewritten official report to the National Geographic Society.
Byrd took a sextant reading of the Sun at 7:07:10 GCT.
His erased diary record shows the apparent (observed) solar altitude to have been 19°25'30", while his later official typescript reports the same 7:07:10 apparent solar altitude to have been 18°18'18".
On the basis of this and other data in the diary, Dennis Rawlins concluded that Byrd steered accurately, and flew about eighty percent of the distance to the Pole before turning back because of an engine oil leak, but later falsified his official report to support his claim of reaching the pole.

Accepting that the conflicting data in the typed report's flight times indeed require both northward and southward ground speeds greater than the flight's eighty-five mph airspeed, a Byrd defender posits a westerly-moving anticyclone that tailwind-boosted Byrd's ground speed on both outward and inward legs, allowing the distance claimed to be covered in the time claimed (the theory is based on rejecting handwritten sextant data in favor of typewritten alleged dead-reckoning data).
This suggestion has been challenged by Dennis Rawlins who adds that the sextant data in the long unavailable original official typewritten report are all expressed to 1", a precision not possible on Navy sextants of 1926 and not the precision of the sextant data in Byrd's diary for 1925 or the 1926 flight, which was normal (half or quarter of a minute of arc).

If Byrd and Bennett did not reach the North Pole, then the first flight over the Pole occurred a few days later, on May 12, 1926, with the flight of the airship Norge that flew from Spitsbergen (Svalbard) to Alaska nonstop with a crew including Roald Amundsen, Umberto Nobile, Oscar Wisting, and Lincoln Ellsworth.
Since 1926, there have been doubts raised, defenses made, and heated controversy over whether or not Byrd actually reached the North Pole. In 1958, Norwegian-American aviator and explorer Bernt Balchen cast doubt on Byrd's claim on the basis of his knowledge of the airplane's speed. Balchen claimed that Bennett had confessed to him months after the flight that he and Byrd had not reached the pole. Bennett died on April 25, 1928, during a flight to rescue downed aviators in Greenland. However, Bennett had started a memoir, given numerous interviews, and wrote an article for an aviation magazine about the flight before his death that all confirmed Byrd's version of the flight.
The 1996 release of Byrd's diary of the May 9, 1926 flight revealed erased (but still legible) sextant sights that sharply differ with Byrd's later June 22 typewritten official report to the National Geographic Society. Byrd took a sextant reading of the Sun at 7:07:10 GCT. His erased diary record shows the apparent (observed) solar altitude to have been 19°25'30", while his later official typescript reports the same 7:07:10 apparent solar altitude to have been 18°18'18". On the basis of this and other data in the diary, Dennis Rawlins concluded that Byrd steered accurately, and flew about eighty percent of the distance to the Pole before turning back because of an engine oil leak, but later falsified his official report to support his claim of reaching the pole.
Accepting that the conflicting data in the typed report's flight times indeed require both northward and southward ground speeds greater than the flight's eighty-five mph airspeed, a Byrd defender posits a westerly-moving anticyclone that tailwind-boosted Byrd's ground speed on both outward and inward legs, allowing the distance claimed to be covered in the time claimed (the theory is based on rejecting handwritten sextant data in favor of typewritten alleged dead-reckoning data). This suggestion has been challenged by Dennis Rawlins who adds that the sextant data in the long unavailable original official typewritten report are all expressed to 1", a precision not possible on Navy sextants of 1926 and not the precision of the sextant data in Byrd's diary for 1925 or the 1926 flight, which was normal (half or quarter of a minute of arc).
If Byrd and Bennett did not reach the North Pole, then the first flight over the Pole occurred a few days later, on May 12, 1926, with the flight of the airship Norge that flew from Spitsbergen (Svalbard) to Alaska nonstop with a crew including Roald Amundsen, Umberto Nobile, Oscar Wisting, and Lincoln Ellsworth.
Richard E. Byrd