If it’s soda cans and they infiltrate the ground servicing crews then they can get their bombs onto a beverage cart.
They just have to have a sleeper onboard to make sure the bomb detonates at the right flight time and altitude and at the right location in the cabin to sever the electronics and set off the chain of events to,break up the fuselage
Report is indicating an Iraqi passenger was the bomber
"If its soda cans and they infiltrate the ground servicing crews then they can get their bombs onto a beverage cart." - silverleaf
That does not seem to present an obstacle in France:
The US isn't any more secure:
If they have perfected timers (based on a digital watch embedded in the can) they don’t need a person to activate the bomb. Just set it to go off in X hours, likely to be mid-flight.