Donovan's corporate jet.
W. Donovan Corporation was the company of American multimillionaire Walter Donovan.
Around 1938, the corporation's industrial interests uncovered the Grail tablet while mining for copper in the mountains north of Ankara. The tablet was a clue to the location of the Holy Grail.
Later that year, Indiana Jones and Marcus Brody used Donovan's corporate plane to head to Venice, Italy where Henry Jones, Sr. had gone missing searching for the second marker to the Cup of Christ.