Rapper Lil Wayne suffered a serious medical issue during cross-country flight, according to TMZ.com. The rapper was traveling from Milwaukee on his way to California, when his private jet had to make an emergency landing in Omaha. The rapper apparently blacked out, as the jet landed earlier this afternoon (June 13). According to reports, Lil Wayne eventually came to, but he’s refusing medical treatment. This isn’t the first time Wayne has suffered from a seizure while traveling on a jet. In 2012, the Young Money boss had two back-to-back seizures, while flying from Texas to Los Angeles. In May 2013, the rapper had another well publicized seizure in Los Angeles. Lil Wayne…