The most common hotspot provider in the US is T-Mobile. You can check out where they have their hotspots,
before signing up, by looking at
http://www.t-mobile.com/hotspot/defa...&WT.mc_t=Other
According to this URL, they do in fact have a hotspot in Philadelphia International Airport.
T-Mobile offer "all you can eat" plans for as little as $29.99 per month. This is
excellent value if you are a regular business traveller. Alternatively you can get a "Day Pass" for $9.99 or pay as you go at around $6 per hour.
Another alternative is I-Pass, a global ISP aggegrator that now provides wireless hotspot access along with their normal analogue service. You can check out I-Pass at
http://www.ipass.com/index.html and look for a "broadband location" (both wired and wireless) at
http://ipass.jiwire.com/
I-Pass tends to be a more corporate service, and I'm not sure if you can sign up individually.
As a regular business traveller, I can tell you having high-speed internet access along with a VPN client, is an absolute life-saver. Now roll on the adoption of Boeing's Connexion service, so we can have live, wireless internet services in planes!!!
Mr Mephisto