The following exert is an eye witness statement. Please read into it what you will. This has been reported to mufon who I am sure are investigating:
This object was close to a plane and disappeared as quickly as it appeared. saw it when i was taking a picture of a nice plane. took 4 pictures and the object cannot be seen in the other pictures. see 2nd photo taken the next day at 2:14pm(took 3 that day), which shows odd object that appears to have windows. i have witnessed many sightings west of tucson in the past 13 years, both day and night.