 Recent studies have reviewed investigations on atmospheric gravity waves, AGW, and traveling ionospheric disturbances, TID, in the Earth's thermosphere and ionosphere, including global model simulations and coordinated observation campaigns such as the Worldwide Atmospheric Gravity Wave Study, WAGs. The first part of the review presents results on the generation of gravity waves at high latitudes and their propagation to low latitudes. The second part describes progress towards understanding AGW slash TID characteristics, revealing the relationship between them through model data comparisons and new inversion techniques. The morphology and climatology of gravity waves and their ionospheric manifestations, TIDs, are also described from numerous new observations. This article was authored by K. Hawke and K. Schlegel.