Supercooled water drops and high concentrations of small ice crystals are critical hazards for general and commercial aviation, respectively. This session will encompass research and development related to improving the analysis and prediction of environmental conditions that lead to aircraft or engine icing.  Topics may include research related to instrumentation, analysis techniques, cloud microphysical parameterizations, and/or data assimilation methods that will lead to improvements in the analysis and forecast of icing hazards including terminal icing, inflight icing and high ice water content. Studies describing recent field programs and associated analyses toward improve numerical weather prediction of aircraft icing conditions (e.g., ICICLE, HAIC, HIWC) are also encouraged.