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Canadian citizens are not required to apply for ESTA (Electronic System for Travel Authorization) in order to enter the United States. Canada is not part of the Visa Waiver Program.Canada and the United States have special agreements that ensure that Canadian and American citizens can easily travel between the the two countries. For this reason, Canadians are not required to apply for ESTA.anada is not part of the Visa Waiver Program. Canada and the United States have special agreements that ensure that Canadian and American citizens can easily travel between the the two countries. For this reason, Canadians are not required to apply for ESTA.
Answers. Best Answer: There is no way no retrieve the ESTA authorization number; if you need to make required changes you need to get a new authorization. Note that flight details and address columns are optional to be filled and do not need to be updated.You do not need a printout of the ESTA to travel; airlines are able to check your authorization electronically. Source(s): https://help.cbp.gov/cgi-bin/customs.cfg... ..https://esta.cbp.dhs.gov/esta/WebHelp/ES... ..nswers. Best Answer: There is no way no retrieve the ESTA authorization number; if you need to make required changes you need to get a new authorization. Note that flight details and address columns are optional to be filled and do not need to be updated.