The T-PARCII team successfully penetrated into the eye of Supertyphoon Lan (2017) and performed aircraft observations on October 21, 2017.

References：
Tropical cyclones-Pacific Asian Research Campaign for Improvement of Intensity estimations/forecasts (T-PARCII)
http://www.rain.hyarc.nagoya-u.ac.jp/~tsuboki/kibanS/index_kibanS_eng.html