The US has sent at least four military aircraft to recover the top-secret components of its crashed F-35C fighter jet in the South China Sea , a Beijing-based think tank said. "[Salvage work] for the crashed F-35C seems to be beginning" the SCS Probing Initiative (SCSPI) tweeted on Saturday, citing satellite images. This comes after the US Navy revealed last Monday that an F-35C Lightning II – its most advanced stealth fighter jet – had fallen into the sea after a "landing mishap" on the USS Carl Vinson aircraft carrier during routine operations. Do you have questions about the biggest…