It was still being taught in Embry Riddle University when I was in Ormond Beach in 2000. They would all say "ready for take off" or "lining up for take off".
Non-English air tragic will know standard RT, and a small amount of English they have heard in the job and elsewhere. Standard RT is all you can assume, and a word such as emergency might be connected to them with the word "lighting" for example. If you use the phrases they have learnt, then they'll sit up!