One of the primary objectives of the Atmospheric Emissions and Reactions Observed from Megacities to Marine Areas (AEROMMA) 2023 field mission was to measure aerosol and trace gas properties to help evaluate and improve the satellite products of the Tropospheric Emissions: Monitoring of pollution (TEMPO) instrument. There was a comprehensive suite of aerosol instruments on the NASA DC-8 aircraft, including measurements of aerosol size distribution (3 nm-50 um), aerosol chemical composition (from both single particle and aerosol mass spectrometers), and aerosol optical measurements over the ultraviolet and visible wavelengths. The DC-8 aircraft also performed multiple vertical profiles that provided important points of comparison between the in situ and remote sensing measurements, such as direct comparison of column-integrated aerosol optical depth (AOD) and aerosol layer height between the in situ and other mode of aerosol measurements, such as satellite-derived values. We will give a brief overview of the aerosol instruments onboard the aircraft and our complete aerosol vertical profile constructed from combining the in situ aerosol microphysical, chemical, and optical measurements. The observation-derived AOD will be compared and validated against AOD values derived from both (1) ground-based measurements (e.g., Aerosol Robotic Network, AERONET) and (2) remote sensing measurements onboard a NASA G-V aircraft with a down-looking, high-spectral-resolution lidar (HSRL) that was operated in patterns in the vicinity of New York, Chicago, and Los Angeles. In addition, these active remote sensing measurements at ambient RH conditions will be compared to the extinction calculations at ambient RH derived from our dry, in situ aerosol measurements on the DC-8, including sensitivity analyses of collocation of these three modes of aerosol measurements. The AEROMMA in situ composition and size distribution data will provide direct validation of the accuracy of and underlying assumptions of aerosol retrievals from AERONET and HSRL. The results from this study will also provide the bases in future validation against aerosol data products from the TEMPO satellite.