Back to the original post though, in my experience, it is not uncommon for passengers to make it onboard the wrong aircraft, with or without electronic systems. The facts are, no system is 100%, including electronic systems. All we can do in the industry is try to get as close to 100% as we can. Once we think that we have achieved 100% security, we will just be proved wrong. So, as a passenger the best thing that you can do in a situation wher you think that the process has failed, is to point it out to those concerned, so that appropriate measures can be taken. And for the record I dont think that the standards of boarding checks is any different between handling agents and in-house staff. I have workied with both, and both have the same mix of professionalism / apathy whetever.