Play Place in the Airport

We traveled by plane with four kids under the age of 7 all the way across these great American States.  As my children crawled under the empty seats on a layover I had an epiphany.  They need play places in the airport.  They need a place parents can take their kids and sit and watch and rest.  Then the kids are all worn out before they get on their flight.  Really it's a courtesy for the other people on the plane to provide that option.  It would be especially good for air ports that serve as major hubs (Denver) or ones close to kid touristy spots (Orlando).