By Parisa Hafezi and Alexander CornwellDUBAI/TEL AVIV, March 4 (Reuters) - The U.S. assault on Iran was ahead of schedule, said the top American commander for the Middle East, as Israel and the U.S. targeted sites deep inside the country, and Iran carried out strikes around the Gulf.The five-day-old war continued to rattle global markets, as airline and tourism industries scrambled to deal with more than 20,000 flight cancellations and governments rushed to bring stranded travellers home from th...