Probably because jet engines operate smoothly at constant RPM so the sound is monotonous and gets tuned out quickly, whereas car engines operate roughly at low

Probably because jet engines operate smoothly at constant RPM so the sound is monotonous and gets tuned out quickly, whereas car engines operate roughly at low and wildly varying RPMs. It also depends on the car--a Toyota Yaris with a 4 speed auto (lol in 2016) would pretty awful, where as a Lexus LS600h with V8 and CVT would be very pleasant.