ok, the best way to do this..
to find what file your plane is,
these files are the most common and work with most programs
If your plane has any of these as an file extension then you can use it in most of these 3D programs
( i'm sure some other people will add to this )
You can download demo's of these programs.
if you plane does not had the extension, then copy and paste this on google ( where plane = the type of plane eg: jet, jumbo, biplane, etc. )
3ds free download plane
you will then find loads of sites that offer planes in the 3ds format
( try www.3dcafe.com
) to start with.
Don't worry about the tiif and alpha for now, just try and get up and running with the above first.