How to make script to trigger aircraft spawn

[planespotter]

Can someone show me a way or a link to a script where this is achieved:

- at time point X
- appears aircrafts X
- at position X
- and flies to waypoints ABC

and if 'time point' could also be made to 'random' this i would find very useful for creating surprises in quick missions

[FG28_Kodiak]

For the first part you need no script:
http://forum.1cpublishing.eu/showthread.php?t=28454