boarding就是走过登机登船的板子，走过板子就不是boarding，而是boarded。

waiting to be boarded  (sitting in the wating area)

boarding  (agent says, group 1 and 2 are now BOARDING, meaning group 1 and 2 can walk to the plane)

see : https://en.wikipedia.org/wiki/Jet_bridge

A jet bridge (also termed jetway,^[1] gangway, aerobridge/airbridge, air jetty, portal, skybridge or its official industry name passenger boarding bridge (PBB)

boarded  (inside the airplane).

no need for confusion.