Very bright, greenish, light in the sky. Exhibited non-aircraft behavior.A bright object, greenish in color, approached overhead. Luminosity was comparable to a full moon. An airplane started flying into the same patch of sky. My wife and I observed the object come to a near stop to avoid the airplane, then change directory (90 degrees to the right and more than 90 degrees upward, into the atmosphere), and slowly disappear from view into clouds high in the sky.