make sure your script vehicle has these settings:

vehicletype/ xxxx
model/ xxxxx
targetname / xxxx

then place a trigger multiple in your map. select it then select your script vehicle.

press shift + v and select the appropriate settings for your vehicle. If you dont know which ones to use click on " ? " next to the item option so you can read a description of what it does and how to apply it to ur map.

U can repeat these steps as necessary for other options that are on or might be available for your vehicle.

next place script structs ( for helis ) and vehicle nodes ( for jets and cars ). place 3 of them(since your only doing a flyby). select the heli first, then your first struct or node and press w so that heli connects to first struct or node. then while that node is selected, select the 2nd struct or node and link them with "w" and do the same process till u reach ur last node or struct.

k/v's that your vehicles nodes or structs should have are:

script_accel / xxxx
script_decel/ xxxx
speed/ xxx
radius/ xxx
target/ xxx
targetname/ xxx

if you dont give your structs or nodes a targetname when you connect them it will give them one. most of these settings u will find when you press " shift + V ".

TUTORIAL

.... you must include the corresponding _vehiclename.gsc in your csv as well as the models for your vehicle.

main() 
{
.....
   maps/_vehiclescript::main( "vehicle_model_name" ); //notice how it is BEFORE the _load::main(); that is very IMPORTANT info
   maps\_load::main();
.......
} 

Try this flying blackhawk attachement.