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A National Oceanic and Atmospheric Administration WP‐3D meteorological research aircraft was instrumented with a wide range of gas and aerosol sampling equipment to conduct a component of the Western Atlantic Ocean Experiment (WATOX‐86) intensive study. The added instrumentation provided for measurements of condensation nuclei, aerosol scattering extinction, ozone, soot carbon, NOx, SO2, H2O2, NO2, peroxyacetyl nitrate, CO, HNO3, and aerosol particle size/number. Discrete air samples were collected in both glass and metal flasks for analyses of a wide range of gaseous species. Aerosol collections included bulk samples on high‐volume filters, single‐particle collections with impactors, continuous size segregated aerosol impactors (with up to nine size cuts), and a range of specialty filters designed to collect gases and gases adsorbed on aerosols. Operational aspects of the four WP‐3D WATOX flights are described along with pertinent observer notes and comments.