USAF Capt. William T. Bowley and Capt. Herbert T. Lange, both of Perrin AFB, Texas, piloting a B-26 on a training flight headed west at 257° at 6,000 foot altitude and 250 knots (300 mph) saw a extremely large and intense bright round bluish-white light with frequent green tints, no trail or exhaust or aerodynamic features, about 3x the size of a C-54 (or about 350 feet) at a distance of possibly 40 miles at their 11 o'clock position paralleling their course at about the same altitude 6,000 feet heading forward but closing with the B-26. After five minutes object suddenly climbed vertically 7,000 feet in five seconds (1,400 feet/sec average, or peak velocity about 2,000 mph at about 17 g's) to disappear in thin broken overcast clouds at 13,000 feet and causing the clouds to glow as if lit by searchlight. Bowley radioed the CAA controller in Tucumcari, N.Mex. Shortly after, the object reappeared under the clouds, the CAA controller was told to look for it but couldn't see it (probably because he was told to look in the wrong direction, to the SW, or it was obscured by clouds), after two minutes it climbed to the west and disappeared.

Google map of this location.