I suspect I know where you are... I've been eyeing those $1300 H fares, too.

I had the opportunity to do a double-bump on LGA-IAH once. Could have done it, too, except that my grandparents in IAH would have been pissed 'cause I'd have missed dinner.

Don't know about int'l, but I suspect you could do it. Especially if they're hard-pressed for volunteers.