The IPDA is affiliated to the American Philatelic Society, Affiliate #AF0261.
The purpose of affiliation with the American Philatelic Society is to provide the IPDA with a formal communication channel and therefore opportunity for the APS to sponsor and engage with the IPDA in such activities as will be mutually beneficial to both the APS and the IPDA.
It also allows the two organisations to promote the fullest possible exchange of information and ideas for the welfare of philately where such opportunities present themselves, at shows for example.
The IPDA designate to the APS is USA Director, Ken Sanford. Ken is a highly respected and recognised individual on the American philatelic scene, not the least because of this contributions to various noteworthy aerophilatelic publications, his own writings and book publications and his membership and leadership in various respected aerophilatelic organisations.