I tried the template and it works ok

I glanced at the mission in the editor, and, man, i wish there were another means of displaying seconds on screen, without the need to define each second's subtitle. Also, i'm not sure if, triggered in this way, each by the previous one, delays won't accumulate so what you see on screen is not necessary one second later, but one second *and* something. Speculating further, if so, maybe triggering subtitles all from an initial timer, but through one-intermediate-timer of 1 sec, 2 seconds, 3 seconds etc. should provide for better time (as i say, pure speculation).
Another thinking loud idea would be at one point to make the plane climb, climb, climb and then dive through circles/gates from height, at high speed, to an under-bridge gate

S!