Plane Crash Riddle (Medium, all ages)

Question: A couple goes on a plane. The plane crashes. The crash is in all the newspapers, on all the news channels on radio and television, and everywhere for everything. You know why? Because every single person died. But the next day, that same couple are found walking on the street, happy as can be, not a scratch or bruise on them. How can that be? P.S.: For more fun, only read this once. Reading it more will give it away plainly, and you came here to have fun, right?

Question: People see through me, but none pass through without killing me. I can be anywhere, and can be seen double or single. What am I?

Question: During what month do people sleep the least?

Question: When is 99 more than 100?

Question: What can be broken but never forgotten?

Question: Surrounded by life , yet life is its biggest enemy. But without life there is no need for it to exist. What is it?