evidence: President Donald Trump's unannounced visit to Iraq was no surprise to airplane buffs. [...] That led to speculation online that Trump was going to visit troops in Afghanistan, or to pay his respects to Turkish President Recep Tayyip Erdogan, who reportedly recently told the president that Turkey would take responsibility for finishing off the Islamic State if the U.S. pulled out of Syria. [...] Asked if he'd had any concerns about making the trip, Trump said, "Absolutely."