entry points security

My husband go to the airport today, because he is an engineer, going today to install a set of entry points security security system, my son is very naughty told me that he want to go to airport, follow father because he wanted very much to look at the big planes, I don’t have promised to him, because when the husband work will forget him, be afraid of the lost son, but the husband is to install entry points security, take son to see son, I’ve always wanted to see the plane? In order to take care of your son, I also follow to, the husband work is on the side when I took the son, let he go running, especially saw the plane, my son will be happy crazy?