on our broadcast tonight fasten your seat belt. this is why pilots say it all the time. what happened at 36,000 feet to cause so many injuries. why it could happen to just about any flight in the sky. raking it in and paying it out. cash for clunkers is going over big, but will it have enough funding to keep going? closing time for post offices across this country. it s a big change. could yours be on the list? and your children s health in the news tonight. what kids aren t getting enough of and the risk that schools are already preparing for. also tonight, is it summer yet? can you blame any folks for asking? nightly news begins now. captions paid for by nbc-universal television good evening. it is called clear air turbulence for a good reason. it is why the captain always says that we ask that you keep your seat belts fastened at all times and in the early morning hours, it struck a continental flight from brazil to texas. at least 26 people were injured, four