It's tough to hear the dialogue over the loud drone of plane engines, never mind the guy passed out in the next seat. (canadianbusiness.com)
Big manufacturers could pay more for the steel they use to make plane engines, auto parts and building materials. (money.cnn.com)
By counteracting environmental noise like plane engines and the murmur of a full cabin, the wearer can more easily ignore some of traveling's most pervasive discomforts. (newatlas.com)