It is not a new finding that contact tracing of flight passengers is a time-consuming procedure [8] . In one study among flight passengers during the pandemic in 2009, 52% (53/95) of the contacts were reached within 72 h [5] . In a measles contact investigation, 75% (202/ 275) of responding passengers were contacted within 72 h. In this study however, the diagnosis of measles was already suspected during the flight, and laboratory confirmation was initiated immediately after landing [19] . It also helped that many contacts were tourists staying at the same hotels, which facilitated tracing them.