PARIS, Mar. 4—By the simple process of flying over Mount Everest, tallest mountain in the world, M. Callizo, daring French flier, hopes to accomplish what climbers have failed many times to do.

Numerous expeditions have fought their way through the lower recess the Himalayas only to be compelled to turn back when they were within striking distance of the top. The last such expedition ended tragically. Everest is still unconquered—the world’s last rebel.

Callizo holds the world’s altitude record of 39,586 feet, the mark Lieut. MacReady, of the United States army, recently endeavored to better in a test at Dayton, Ohio. Everest is 10,000 feet lower than this, being 29,140 feet above sea level. However, exploring the summit by air is not merely a matter of achieving altitude. That would be simple enough.