When it comes to flight information, or to be more accurate, flight statuses, push notification can be a godsend. Case-in-point, Worldmate Gold (iTunes link), one of the first iPhone travel apps to utilize the new OS 3.0's push notification capabilities. The downside? It's $20 (well, $19.99).If you do much traveling this is one iPhone app you may actually be delighted to pay that $20. Also, there's also a free version (iTunes link), although that version does not have push, the compelling feature of the app. If you're quick though, you can grab one of the 40 free copies of the Gold version WorldMate is giving away to TechCrunch readers. Simply email techcrunch@worldmate.com and they'll contact you if you've won.