Interestingly according to videotaper and eyewitness on may 13 one day prior to above news report he had also videotaped UFOs near another Airline commmercial jet over Denver too.
According to him "Yes it's really strange I don't know any more than everybody who has seen this clip. I was filming at 210 frames per second in a high speed mode as these objects fly very fast and they are a blur at 30 frames per second..
Also the video camera was altered by removing the Infra-red filter in front of the camera CCD, (the optical sensor) and a red filter was placed in front of the lens to filter out the blue and the green bands of light .. So basically the objects where invisible to the naked eye and not visible.. The amplification was set to 20 times (X20) and filmed in to the Suns rays (the Suns corona) to back-lite the objects. I now see all kinds of strange objects in the sky by this method and it is very inexpensive and easy to do for the technical minded individual,I should note that with the new type of very high speed multi-frame DSLR cameras it's easy to capture these type of objects, all you have to do is to set the focus to infinity and shoot 30 frames in to the blank sky, and shoot in to the Suns light but don't get the Sun in to the frames and save the photos and blow them up on a large computer screen and you will get always some type of objects and you will discover the wonderful world of trolling for UFO's (Un-convetional, Flying, Objects) in the sky, even when the sky seems empty... I would suggest focusing on commercial aircraft as it will give you some measure of scale to determine the distance and size of the strange objects.."