The Senate hangar of the New Republic's Galactic Senate was located on the planet of Hosnian Prime. This hangar served as a parking area for starships belonging to Senators, and it also housed the Precision air team.
Starkiller Base completely obliterated the Hosnian system in 34 ABY.
The canon novel Bloodline, written by Claudia Gray and released in 2016, marked the initial appearance of the Senate hangar.