<p>The flight, LH 751 had taken off from the airport at 1:15 AM, but soon passengers reported smoke filling the cabin, after which the pilot decided to land, airport sources said.<br />The plane landed safely at 3:15 AM, they said.<br /><br />The sources said that the aircraft had developed a 'critical engine error'.</p>
<p>The flight, LH 751 had taken off from the airport at 1:15 AM, but soon passengers reported smoke filling the cabin, after which the pilot decided to land, airport sources said.<br />The plane landed safely at 3:15 AM, they said.<br /><br />The sources said that the aircraft had developed a 'critical engine error'.</p>