As you appear to be travelling with a youngster, I'd suggest making them wail or scream exceedingly loudly at all security points so no-one will want to delay your swift passage out of hearing range.

When travelling with Johannes the Violin I tend to feign total deafness or "no speekee Inglese" with the initial lurking bag sizing goons and then if there is any issue turn on the charm at the actual trays/scanning palaver. I've noticed also that people who carry their wheelie past BAA's Finest rather than wheel it, seem to be less likely to be stopped. Anyone else notice that?