Well that's cool for the principle but...
Seriously? 1$ per flights? xD
That's not really what I would call cashback xDDDD
The others promotions are cool though, I'll bookmark you in case I need to book an Hotel or something like that
$1 back on flights, might not seem like much, but most booking agents make only $5 on the booking, so it's 20% of their profit.
This amount was set by airlines some years back.