Giant / Giant S1 repair requirements

I'm transitioning my fleet to Giants and I'm trying to figure out what you need to repair them. I've got some S1s now, and when they break it's either pay 2 green (yeah, eff that) or wait 12 hours. Do regular Giants behave the same way, or can you fix them with parts? I've manually paged through lots and lots of forum entries (as I've complained about before, forum search has NEVER worked for me), but I haven't seen anything on the topic.

In a related story, does anyone have any Giant S2s? I've been hoarding my tokens waiting for GI to make them available.

Cheers,
--Chris

Green cash or wait for Giants. Sometimes I get lucky and exit the game and come back a couple of hours later and they are magically fixed. For the most part I just pay the $2 green and push on. Currently have five silver Giants in the fleet flying two sorties each per day for a total of ten flights. Really don't have time to wait for the planes to get fixed to stay on schedule.

Been waiting myself for a gold Giant, but haven't seen them on sale yet.

I have an S2 giant and an S1. There are no parts for them, just wait or pay 2 greenies. Indeed if you exit the game for a while the repairs seem to be faster.