Aero was launched as 'the new chocolate' by Rowntree in October 1935, at a cost of 2d.(old pennies). Initially it was available only in the North of England, distribution expanding throughout the UK the following year. By 1936 Aero had reached New York. It was one of the first products promoted by Rowntree primarily on the strength of the brand, rather than the company name.
Aero's success owes much to its unique bubbly texture. From the first television advertising campaigns screened during the 1950s, the secret bubbly formula has proved a major success in providing the inspiration behind the 'Lovely Bubbly Aero' campaign.