Delta Airlines Beijing Office +1-888-839-0502
I went to the Delta Airlines Beijing Office for assistance since I was unsure of the visa requirements for my stopover in the United States on my way to Mexico. The agent printed up a checklist for me and was very informed. Even though they don't provide visas, they helped me find the appropriate embassy and ensured that my flights matched all required paperwork. Very comforting and useful, especially for someone who is going abroad for the first time!