The I-2000 LFS is a concept-plane made for the LFS project. However, the project was cancelled in favor of the PAK FA program (which later resulted in the Su-57). The S-55 LFS was also spawned from this project (which also appears in the AFD series). This would not be the end for the interesting I-2000, however; the plans influenced the design of a recent aircraft, the Iranian HESA Shafaq. As a result, the I-2000 interestingly lives on through that plane.