In real life, the aircraft used to take Eichmann to Israel was a Bristol Britannia. However, these turboprop machines had very short working lives due to the popularity of jets and thus none were available for the film.
As a result a Boeing 707 jetliner was used instead in the film. Worse, it appears to be a JT3D-engined Intercontinental (a -320B or -320C) even though the -320B did not first fly until 1962 and the -320C was not introduced until 1964.