Measurement system validation is critical for advanced satellite sensors to achieve their full potential of improving observations of the Earth’s atmosphere, clouds, and surface for enabling enhancements in weather prediction, climate monitoring capability, and environmental change detection. Field campaigns focusing on satellite under-flights with validation sensors aboard high-altitude aircraft provide an essential component important for performing such satellite measurement system validation. The NASA Langley Research Center National Airborne Sounder Testbed – Interferometer (NAST-I) is a cross-track scanning Fourier Transform Spectrometer system that is frequently deployed aboard NASA aircraft as part of the key payload sensors in validation and airborne science field experiments. One recent experiment, the Suomi NPP (SNPP) Arctic airborne field campaign (SNPP-2), was conducted out of Keflavik, Iceland between 7-31 March 2015 to address SNPP validation and JPSS risk mitigation for very cold scene observations and satellite sensor cross-validation (i.e. between the advanced satellite infrared sounders CrIS, AIRS and IASI) in the Arctic region. This paper addresses benefits achieved from such airborne validation field experiments and focuses on cold scene radiances observed during the SNPP-2 campaign; emphasis is placed on inter-comparisons between the NAST-I airborne observations and those from the Cross-track Infrared Sounder (CrIS) aboard the SNPP satellite and, with a particular focus on, handling the presence of non-uniform scene conditions.