You have the ISO right. 80 is 'slower' than 1000. The lower the ISO number the less sensitive it is to light, thus giving you longer exposures. If you were shooting the waterfall in daylight 8 seconds was too long which is why the shot was overexposed ('whited out'). This is where ND (neutral density) filters come in handy.

I hope you don't mind a small correction. Aperture and f-stop both reference the same thing, so you are setting your aperture to f-stop 2.8, etc. Shutter speed would be the time of the exposure, such as 2 seconds or 1/250th of a second,etc.

It sounds like you got a good exposure of the plane, but the issue seems to be with white balance. Depending on the type of lighting in the scene of your shot, you will get different color casts. Incandescent or halogen lighting will give you that yellowish color you saw in your plane shot. Florescent lighting will give you a greenish cast. Sodium vapor street lights will be very orange, and mercury vapor will be bluish green if I remember correctly.

I do not have the same camera, but I would hope there's a way for you to set the white balance. The camera should have presets for daylight, shade, incandescent, and florescent. These will work better than AWB (auto white balance) in artificial lighting.