Like many parents we sometimes struggle to think what we can do with our child at the weekend which doesn't cost the earth. I have just remembered that Manchester Airport has a special aircraft observation area 'Manchester Aviation Park' where you can see planes on the runway. It is also the home of Concorde and it is possible to arrange for tours. They have other aircraft which you can go aboard without prior arrangement. It costs £4 per can and £1 per passenger over 4 years of age.