Good... do use it also thrice and thou, all in dictionary or reached (for arrived) from Hindi/Bengali (and possibly other Indian languages I do not know where the word is used interchanageably-- not all though. Marathi and Telugu have separate words for reached and arrived)

They just confuse me as a speaker of a more orthodox sort of Englkish when used in flight announcements etc thats all

About prepone being English per your capitalisation I dont know.

Please see below, bold:

pre·pone [ pree pṓn ] (past and past participle pre·poned, present participle pre·pon·ing, 3rd person present singular pre·pones)


verb South Asia
Definition:

1. transitive verb bring planned event forward: to arrange for an event to take place earlier than originally planned


2. set for earlier time: to reschedule something for an earlier time or date

late 20th century

I think this is getting off topic so if you wish to discuss this further please pm me