In the init field of all the guys you want to be passengers, simply place
guy assignascargo plane where guy = the units name and plane = the planes name. [edit] Or better still
this assignascargo plane . this allows you to copy and paste the init field without typing it in each guys field if u have lots of guys. Ive had 20 men in a hawk c130...
Then, when making the "getin" waypoint for the group of guys, hold down the
shift key and double click on the aircraft. This will fix that waypoint to that aircraft.
If your scripting the whole mission, its a little trickier, and a little beyond my realm of expertise. But still using the assignascargo command in the init field of you passengers, the scripted line to get them to board the plane might look like this
[guygroup,0] setWPPos getPos plane where guygroup = the name of the group the passengers are in (use setgroupid command) and 0 is the which ever number the waypoint is within the order eg. the 1st waypoint = 0, the 2nd waypoint = 1, 3rd waypoint = 2 and so on...
If scripting, try that... if im wrong, ill be corrected shortly, but play around, you might luck it