Yawns can be caused by boredom. When watching an uninteresting performance, movie, or recital a person may have a bout of excessive yawning. To suppress the yawns, he can hold his mouth closed tightly and clench his jaws. When the yawn comes on he must keep the pressure in the rear of his jaws and swallow the yawn. Excessive yawning, caused by sleepiness, can be counteracted by drinking lots of water. Dehydration is a big cause of fatigue. When a person drinks a lot of water, the yawning will cease. Every time the urge to yawn is strong, drink a big gulp of water and the yawn will pass.
According to the Jet Airliner Crash Data Evaluation Center, JetBlue ranks as the safest U.S.-based air carrier, as of publication. Southwest, Delta, United and American Airlines round out the top five in U.S. safety ratings.
MUMBAI: Air India has been rated the world's third-most unsafe commercial airline by a German airline safety think-tank in a ranking that was debunked by the national carrier. Among the 60 carriers featured in the listing released last week, Helsinki-based Finnair was graded the safest and China Airlines the least safe.