The amount of apps in the Windows Phone Marketplace
Microsoft's Windows Phone Marketplace has now reported to have passed 25,000 apps by one site tracking comings and goings within it. (source: WindowsPhoneAppslist, July 2011)
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#3,
RFID doesn't have to be short range. Those toll tags (EZ-Pass in the NY area) are RFID tags.
It's kind of silly that the airlines haven't done this. It's not as hard as you'd think to implement an RFID system. Bascially, you need readers, a database, and tags.
The problem is when you get into high-data situations, like every item in a Wal-Mart being read every 10 seconds. That's a couple of million data points being fed in every 5 seconds.
The airlines won't have anywhere near that much data. They will, though, have a lot more interference and load, being distributed and all.
Maybe they should contract with FedEx to do the tracking. FedEx's tracking system is pretty unbelievable. Last I heard (4 years ago), the average lookup time for a tracking number was around .3 seconds. Adapting their system to RFID shouldn't be a big deal, as long as you can get good data out of the readers.