Routing of contact tracing for close passenger flight contacts during the influenza A/H1N1 2009 pandemic. A request for contact tracing (CT) reaches the NFP of the RIVM (1). After checking the indication, the request is forwarded to the MHS/GGD Kennemerland (2) who will submit the request at the appropriate airline (3). The airline collects contact details of the passengers and returns this to the GGD (4). Dutch contacts will be informed through the MHS of their region (5, 8), international contacts list are returned to the NFP/RIVM. The NFP requests the concerned public health authorities through the NFP or EWRS contact points to trace the contacts (6, 7).