John Ludlow, Airmic CEO, said he was thrilled with the new additions.
"I am delighted to welcome HDI and Travelers into full partnership with Airmic.
"HDI has been a long-standing supporter of our mission and work, and becoming a full partner is the natural progression in our relationship.
"We are also proud to welcome Travelers with its strong heritage, and strength and diversity of product lines."
Members can visit HDI and Traveler's websites using the following links: