Halfbakery: vehicle: airplane: noise http://www.halfbakery.com/view/fc=10531:s=c:d=iw:dn=100:ds=A:i=Ideas_20are_20sorted_20alphabetically_2e_3cbr_3e_0d_0a_3ccreated_3e:t=vehicle_3a_20airplane_3a_20noise?op=editview Ideas are sorted alphabetically.<br> <created> Halfbakery (mailto:bakesperson@gmail.com) Baby Helmet (0.5) http://www.halfbakery.com/idea/Baby_20Helmet Child-free Airplanes (0.5) http://www.halfbakery.com/idea/Child-free_20Airplanes Coughing and Non-Coughing Flights (0.0) http://www.halfbakery.com/idea/Coughing_20and_20Non-Coughing_20Flights Crying Children Noise Cancellation Headphones (0.0) http://www.halfbakery.com/idea/Crying_20Children_20Noise_20Cancellation_20Headphones In-flight noise cancelling (-0.5) http://www.halfbakery.com/idea/In-flight_20noise_20cancelling Kids Room (0.5) http://www.halfbakery.com/idea/Kids_20Room Pulsejet Auxiliary Engine (0.5) http://www.halfbakery.com/idea/Pulsejet_20Auxiliary_20Engine Soundproof walls for airplanes (0.5) http://www.halfbakery.com/idea/Soundproof_20walls_20for_20airplanes squalling section (1.0) http://www.halfbakery.com/idea/squalling_20section