Why does iPhone Internet not work at O Hare?

What is the reason that my iPhone 4G Internet doesn't work at Chicago O'Hare Airport. They must shut it off somehow, it works only close to windows and then barely.
I fly standby and missed my connection flight so I keep up with info through my phone. This is very inconvenient if my phone doesn't work.

The building construction probably cuts off the reception a lot

just get in range of a Wi-Fi hotspot, which should have most of the airport covered.

its illegal to block cell reception, so they don't "shut it off shomehow"

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