Understanding the structure of deep convection is important for a number of reasons for example vertical transports of mass and moisture, rainfall, and hurricane intensification. Global measurements of deep convection have mainly been from satellite, such as TRMM that provides an indirect estimate of intensity from the radar reflectivity. Ground based radars have on the other hand provided detailed measurements of the wind and precipitation structure in convection but mainly in a case study setting. This presentation discusses what we have learned about the structure of deep convection from high-altitude airborne radar measurements from a number of field campaigns mostly in the tropics and subtropics. The emphasis will be on the updraft structure in the deep convection, as well as what we have learned about the microphysical structure from dual-wavelength measurements. Finally, several new airborne radars that will improve our understanding of clouds and precipitation will be discussed.