I remember i went to see a shuttle launch when i was 6 years old, went all the way to america and went to watch the launch and was supposed to see it on the last night i was there. Went to the beach to watch the launch and after about 4 hours of delays they were ready to go...... They cancelled it on 3 seconds to launch and posponed it until the next day. of course I went home that morning and never got to see the shuttle launch.
That shuttle was challenger i dont think I need to say anymore.
And yes sanford is probably the cheapest american flight from the UK and its cheap because it doesnt come under the same rules regarding home airlines flying transatlantic. Strange but true...