It is attempts like this to circumvent baggage policies which will inevitably force airlines to weigh the individual passengers as well as their baggage - and imagine the outcry that would cause. Do people not realise that in the simplest terms, the weight loaded onto an aircraft affects its ability to fly. If every passenger smuggles an extra unaccounted for 10kg onboard, the aircraft may be 2 tons heavier than the crew think it is. With normal reduced thrust takeoffs, performance margins may only be a few hundred kg, resulting in overweight takeoff attempts. The potential hazards should be obvious. No doubt the couple in the article think they are very clever and will make lots of money.