A twinkling light popped through the clouds while I was on a large plane; it zipped around, changing directions, then took off upward.I was on a Southwest Airlines flight from Albuquerque to Houston. We were about halfway through the flight. I was gazing out the window; there was solid cloud cover below the plane. Suddenly a light popped up through the cloud, then stopped. It zipped to another spot and stopped again, zipped another direction then stopped, and continued this zipping and stopping action about 20 times, changing direction each time. It moved very fast and stopped very fast. Then it zipped up and out of my sight. I watched this for about 30 seconds. It was 9:05pm Houston time. The light twinkled and resembled "Tinkerbell" on the old Peter Pan movie.