highest / greatest / too (much) / very / extremely
太
=
丶
+
大
:
Mnemonic symbol: from 太后 [tai4 hou4], the empress dowager. The empress dowager prepares for her reign in the airplane's bathroom (ai4) and has a big robot (大) as well as Tecumseh (t) fan her fresh air with petal leaves (丶).
妹
=
女
+
未
:
Bessie Coleman, (女) her younger sister (妹), Mahatma Gandhi (m) and Ai Weiwei (未) are playing a game of Schafkopf in the Eiffel Tower's bathroom (ei4). Somehow Bessie and her sister always end up in the same team, which makes Mahatma Gandhi and Ai Weiwei very suspicious.