Well in evidence in this in-flight study are the end-plates added to the tailplane of 747 N905NA. Traces of the markings of the airliner's previous owner, American Airlines, are also visible.

Самолёты на фотографии: Aircrafts on the photo: Boeing Boeing 747 - СШАUSA - 1969

The Orbiter carrier over the Rocky Mountains, minus its charge. The Orbiter struts and end plate fins are easily removable

Самолёты на фотографии: Aircrafts on the photo: Boeing Boeing 747 - СШАUSA - 1969

Самолёты на фотографии: Aircrafts on the photo: Boeing Boeing 747 - СШАUSA - 1969

FRANK. R. MORMILLO's plate, taken during one of the five unmanned captive flights of the orbiter atop the Boeing 747 which commenced from Edwards AFB on February 18, 1977, shows the conspicuous bulged fairing which presently streamlines the Orbiter's blunt rear fuselage.

Самолёты на фотографии: Aircrafts on the photo: Boeing Boeing 747 - СШАUSA - 1969

A close-up of the attachment points beneath the Orbiter wing.

Самолёты на фотографии: Aircrafts on the photo: Boeing Boeing 747 - СШАUSA - 1969

The rear fuselage fairing and fin and rudder of the Orbiter.

Самолёты на фотографии: Aircrafts on the photo: Boeing Boeing 747 - СШАUSA - 1969

Самолёты на фотографии: Aircrafts on the photo: Boeing Boeing 747 - СШАUSA - 1969

The sheer bulk of the Orbiter makes it appear too heavy for the 747 to lift.

Самолёты на фотографии: Aircrafts on the photo: Boeing Boeing 747 - СШАUSA - 1969

Access to the Orbiter is achieved by means of this hydraulic platform.

Самолёты на фотографии: Aircrafts on the photo: Boeing Boeing 747 - СШАUSA - 1969

The take-off for the first manned captive flight on June 18, 1977, with astronauts Fred Haise and Gordon Fullerton aboard the Orbiter. Flutter, the Orbiter speed brakes, and control stick steering were checked out during the 55min flight.

Самолёты на фотографии: Aircrafts on the photo: Boeing Boeing 747 - СШАUSA - 1969