搭 means to board (a vehicle) and is a JLPT N1 kanji. It has 12 strokes and uses the hand (side form) radical (扌).
Stroke order · 12 strokes
On'yomi (音読み)
トウ
Kun'yomi (訓読み)
—
Radical
扌 · hand (side form)
Strokes
12
How to remember 搭
Lifting something up with the hand (扌) and setting it in place — boarding. 搭乗 — boarding! 搭乗口 means the boarding gate; you'll hear it on the day you fly home.