Watch the trailer below, then read on to find out why you haven’t seen it until now: [youtube]http://www.youtube.com/watch?v=LZaRCEI4Hr0[/youtube] The good news for naval aviators, students of the 1980s and fans of Kenny Loggins — a remastered, 3-D version of “Top Gun” will hit IMAX screens nationwide later this week. The trailer says it’s a six-day engagement beginning Friday, but some theaters will have special Thursday screenings. Why only six days? And why not a mainstream marketing push? Why wasn’t a shirtless 3-D Tom Cruise playing volleyball during commercial breaks of the Super Bowl? Although Cruise’s cocky Maverick may be the…