Everyone knows what they are: the lights that iluminate the logo on an aircrafts tail.
My question is, which aircraft have them? And sometimes when im spotting, ill see for example a CO 737-300, and a US 737-300 and the CO will have its logolight on and the US wont. Is it up to the pilots to choose whether or not to turn it on? and last but not least, are the logo lights on for the duration of the entire flight? Thanks in advance.