EntityQ3306357· pop 8· linked from 67 articlessubsonic aircraftSign in to saveaircraft with a maximum speed less than the speed of soundConnectionshelicopterEntitymass densityEntityaircraftEntityairshipEntityspeed of soundEntityaerodynamicsEntityMach numberEntityaltitudeEntityballoonEntityairlinerEntityliftEntitypropellerEntitySupermarine SpitfireEntitydragEntityturbojetEntitywingspanEntityturbofanEntityramjetEntitysound barrierEntityAero L-159 ALCAEntityCategoriesAircraft by type