We frequently holiday in Mallorca and more often than not see a strange light display on the odd airliner coming overhead, This is something like 2 octagonal light formations on the underside of the aircraft. Does anyone know anything about this?
closed as off-topic by hippietrail, Mark Mayo, Karlson, VMAtm, Dirty-flow Oct 22 at 15:12
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Any aircraft must have these lighting systems:
Now what you saw must be a combination of all of the above. Some aircraft look like a moving party at night, I remember the MD90s for example having a funny lights system if all lights are on.