The post discusses the auditory phenomenon associated with the sound of passing airplanes, particularly focusing on the superposition of sounds from multiple engines. Users speculate on the impact of engine configuration on sound perception and the possibility of verifying this theory through personal experiments. Comments point to a fundamental misunderstanding of the Doppler effect, highlighting the community's interest in engaging with the science of sound. Overall, the discussion reflects a blend of curiosity and a desire to better understand acoustic phenomena.