A Delta Boeing 767-400 in the sky.SOPA Images/GettyA Delta flight declared a mid-air emergency after a suspected lightning strike.The plane was inspected post-landing, and no injuries were reported due to lightning.Commercial planes are hit by lightning once or twice a year on average.A Delta flight landed safely in Atlanta on Tuesday morning after declaring a mid-air emergency following a suspected lightning strike.Delta flight 1192 was traveling from New York City to Atlanta early Tuesday when it encountered two unrelated emergencies, according to local media reports.A Delta spokesperson told Fox News that officials believe lightning struck the plane during its journey.