You need to talk to Airport people/guys to allow your customer to access the wireless network when he gets in the Airport. The wireless ethernet card in the laptop need to associate/connected (via wireless) to the Access Point maintained by Airport guys.
Many thanks for your reply. Could you tell me if the configuration in airports are depending on the provider which means if he has to change a few times he could have to reconfigure his PCMCIA the same number of time ?
Yes the configuration is dependant on the hotspot operator.
Often they use a broadcast SSID and no WEP then use back end services to limit access. If you use a profile with NO SSID configured and everything else defaulted then you may find that you will associate to the Hotspot. The better ones use a TCP redirect when you open a web browser to a login screen where you can sign up for service.
There sometimes is posters or pamphlets at the hot spot that will give you the details on how to set up your card
At the end of the day though your customer will have to open an account with the hotspot operator and they will give him the instructions on how to log on as they are all different