New entry requirement now in effect: visa-exempt foreign nationals who fly to or transit through Canada are expected to have an Electronic Travel Authorization (eTA). [url=http://www.cic.gc.ca/english/visit/visas-all.asp#eta-exemptions]Exceptions[/url] include U.S. citizens and travellers with a valid Canadian visa. Until September 29, 2016, travellers who do not have an eTA can board their flight, as long as they have appropriate travel documents, such as a valid passport. [url=http://www.cic.gc.ca/english/helpcentre/results-by-topic.asp?st=16.7]Find answers to your questions about the leniency period[/url].

Entry requirements for other methods of travel (land, sea) have not changed.

现在eta已经开始生效使用，但是如果是9月29号前去还是可以不用申请eta的吗？

这个理解对吗？