US executives from Apple, Tesla, Boeing and more, have accompanied Trump on a visit to Beijing to visit with Chinese President Xi Jinping. Apple CEO Tim Cook has left his successor, John Ternus , minding the store as he once again visits China. Rather than representing Apple per se, though, Cook is one of around a dozen senior US businesspeople invited to join Trump on his trip. Cook reportedly did not travel with Trump on Air Force One. However, according to the Wall Street Journal , he has now been pictured at China's welcoming ceremony at the Great Hall of the People in Beijing. He's also been filmed on social media walking alongside Elon Musk, and briefly greeting reporters. Why Cook is in China As Cook has previously learned , turning down an invitation from Trump just leads to problems for Apple. Beyond this politicking, though, the White House has reportedly claimed that the trip is to foster business deals for all concerned.…