Checked in luggage
What happens in a situation where a passenger checking luggage into the hold tells the member of staff at checkin that they did not pack one of the bags himself? I am due to fly with my friend's two girls (aged five and eight) to Glasgow next week. They are at their Dad's right now and I will be taking them back to their Mum's. I was going to go up and visit anyway so we thought we'd kill two birds with one stone by getting me to meet their dad at the airport and I'd take them on the plane back home. Obviously their dad will have packed their suitcases and not me. Now, I'm not for one second suggesting that he would so anything silly security-wise but I did wonder what the procedure was for a situation like this.