The Infrared Atmospheric Sounding Interferometer (IASI) instrument was launched on the METOP satellite in October 2006 (delayed from April 2006). The European Organisation for the Exploitation of Meteorological Satellites (Eumetsat) is providing funds for the Facility for Airborne Atmospheric Measurement (FAAM) aircraft BAe146 to be involved in validation of IASI radiative transfer and some level 2 products. Flights were flown over oceans to coincide with METOP satellite overpasses. Further flights were flown low level over specific land calibration sites to characterise land surface emissivity. There were co-incident flights with other platforms including US ER-2 or Proteus aircraft and French high altitude balloon. This dataset contains FAAM flight tracks and flight summaries, it does not, however, contain data collected by IASI on the Metop satellite.