美国有过境签证吗？
美国是有过境签证的，只是目前中国大陆出发没有转机服务而且去美国的目的也是非移民类所以一般不需要。 以下是我从网上找的资料，具体我也没有去过美国不过这些知识应该还是靠谱的吧
1.B2旅游签证 B-2 visitor visas allow foreign nationals to visit the United States for reasons of business (e.g.， tourism or transiting) or pleasure. It is a nonimmigrant visa and can be issued only at U.S. Consulates abroad by American diplomatic officers in Visa Section， since they are not present in mainland China which has over 30 million US citizens. This visa requires applicants to provide proof that they have enough funds necessary for their stay; also， an approved itinerary must be presented as well as any other supporting evidence showing the trip’s purpose is truly for holidaying. Such application will then be reviewed based on its merits， with a final decision made upon whether it may be granted or denied.
If you do receive this kind of letter denying your request for travel permission， please make sure you take care of all relevant papers carefully before discarding them！ Otherwise if some paperwork such as bank statements slip out of your hands accidentally when you are going through customs inspection， you might end up being arrested！ The worst case would be losing access to your passport because there was no paper trail proving your identity left behind – even though you still legally own these documents， you should always keep everything related to yourself together so nothing goes missing！ In addition to keeping important legal records safely away from prying eyes， you could place them inside an envelope addressed in block letters and mailed to yourself – either via a registered post service or sent straight to your home address using courier delivery services like FedEx， UPS etc.， provided you get confirmation slips stating exactly where each piece went！ Alternatively， one could put it into a safe deposit box but note： remember where this account number exists too whenever dealing with banks hence avoiding problems down the line！ Another alternative option worth considering here involves opening up online banking accounts； whilst these aren't ideal due in part owing to the fact customers cannot go back and forth physically between branch offices at their convenience if issues were ever encountered during daily transactions