lucky you, don't get used to it though, that sounds highly irregular for them, but hey enjoy it while you can
one thing, no matter what, no matter what they say/beg/promise, don't EVER, and i mean EVER tell them you'll be at the airport less than an hour from when they called you, even if you can get there, or do get there, don't ever tell them that you can, thats one of the most important contract parts for reserves and they'll try to sweettalk you in to showing up as soon as you can, which from your side will always be "i'll be there in an hour" capise?
sorry, didn't mean to sound like i was comin down on ya, just givin ya some hopefully helpful info