Wardle founded his agency more than 40 years ago after a long and varied career, which included running a fleet of local buses in Staffordshire.
ITT Chair Steven Freudmann shared the news in an email to ITT members on Wednesday (2 September).
Wardle was an ITT conference regular, and was known for preceding his questions with a booming "Doug Wardle, Wardle Travel!".
"Our dear friend and great ITT supporter, Doug Wardle, died this morning aged 92," said Freudmann. "Our thoughts are with his wife, Ruth and his son, Chris. Conferences won't be the same without, 'Doug Wardle, Wardle Travel!'."
