The digital travel health pass will debut on Apple devices, with an Android version to follow.
The app will will allow passengers to certify their Covid-19 status.
Travellers will be able to do this by uploading a vaccine certificate, evidence of immunisation, or a negative Covid-19 test result.
Virgin Atlantic last week became the latest major airline to confirm it would trial the app.
Others include Singapore Airlines, Korean Air, and several Gulf carriers – including Qatar Airways and Etihad.
Iata had initially hoped to launch the app in March.
On Wednesday (31 March), Kamil Alawadhi, Iata regional vice-president Africa and Middle East, said the app would be available through Apple’s App Store "around 15 April" and would be followed by an Android version, Reuters reports.
"The application will only achieve its success once airlines, different countries, airports adopt it,” Reuters reports Alawadhi as saying.
Virgin is also trialling the TrustAssure platform, while British Airways is working with the VeriFLY pass.
Several other passes are being examined by travel, including the World Economic Forum’s CommonPass.
