Cloud iridescence is a colorful optical phenomenon which occurs in a cloud and appears in the general proximity of the Sun or Moon. The colors resemble those seen in soap bubbles and oil on a water surface. It is a type of photometeor. This fairly common phenomenon is most often observed in altocumulus, cirrocumulus, lenticular, and cirrus clouds. They sometimes appear as bands parallel to the edge of the clouds. Iridescence is also seen in the much rarer polar stratospheric clouds, also called nacreous clouds.

Iridescent clouds
There are many potential explanations for sightings. We recommend eliminating the most common and mundane before jumping to less probable conclusions or you submit a report.
Resources
Flight & Marine Trackers
Live flight tracking maps are available for monitoring airline traffic and trajectories in real-time or historically around the world.
FlightAware
Flightradar24
ADS-B Exchange
Marine Traffic
Space Launches
Planned launches occur regularly all over the globe. These tracks can help identify the potential missions or launches in your area.
SpaceLaunchSchedule.com
SpaceFlightNow.com
RocketLaunch.Live
Satellite Trackers
Satellite tracking can also be done in real-time with the aid of tracking maps. They are also helpful for tracking Starlink launches.
Heavens Above
Space Weather
There are a number of sites which track solar flares, magnetic storms, and other events which are helpful for eliminating explanations related to astronomic phenomena.