At the risk of starting another Boeing versus Airbus thread, I'd like to point out a pretty obvious design fault on the Airbus (though obv I stand to be corrected by engineers various)
The Airbus engines' doors just hang when unlatched. They fasten underneath and so it's very difficult to see when they're in that position.
Boeing's doors open differently and have to be fully in either position. They 'pop' semi-opened if not latched properly.
That's what I've been told anyway!