Aero is an aerated chocolate bar manufactured by Nestlé. Originally produced by Rowntree's, Aero bars were introduced in 1935 to the North of England as the "new chocolate". By the end of that year, it had proved sufficiently popular with consumers that sales were extended throughout the United Kingdom.
By 1936, sales of the chocolate had reached New York City, and later spread to many other countries including Canada, South Africa and Japan. Aero has been manufactured by Nestlé since 1988, after a takeover of Rowntree's. Known for its unique "bubbly" texture that collapses as the bar melts, it is available in many different flavours, and various forms including Aero Bubbles and Aero Biscuits.