Stewart said WestJet had been informed by U.S. Customs and Border Patrol (CBP) that the ban did not apply to dual citizens who had passports from countries other than those covered by the ban: Iran, Iraq, Libya, Somalia, Sudan, Syria and Yemen.
"Iran, to defend the dignity of the great Iranian nation, will implement the principle of reciprocity until the removal of the insulting restriction against Iranian nationals", the Iranian foreign ministry said in a statement.
On Friday, Trump signed an executive order banning Syrian refugees and citizens from Iran and six other Muslim-majority nations from entering the U.S. The order includes the suspension of U.S. visas for citizens of these nations for 90 days and of the U.S. refugee program for 120 days.
Tehran's foreign ministry said in a statement it would enforce its own ban "until the offensive USA limitations against Iranian nationals are lifted".
"The decision by the USA includes illegal and irrational expectations which are against worldwide law", said the statement.
Actress Taraneh Alidoosti who stars in the Iranian film "The Salesman" that has been nominated for the best foreign language film tweeted on Thursday: "Trump's visa ban for Iranians is racist".
West Brom could extend Premier League career of Chelsea outcast Branislav Ivanovic
They are now weighing up whether to go back in with a renewed bid for Celtic's Craig Gordon after having a £3m offer rejected. When I switched to three at the back, something changed, for sure, I have to make decisions as I can pick only 11 players.
Since the order's travel ban applies to all "aliens" - a term that encompasses anyone who isn't an American citizen - it could bar those with current visas or even green cards from returning to the U.S. from trips overseas, said Stephen Legomsky, a former chief counsel to the U.S. Citizenship and Immigration Services under President Obama.
Since the 1979 revolution, the USA and Iranian governments have always had their differences, but USA policy has generally focused on opposing the government of Iran; not the Iranian people.
Trump made "extreme vetting" of foreigners a cornerstone of his campaign, particularly those from countries that are predominantly Muslim and that he considers hostile to the U.S.
French President Francois Hollande said Europe must have a "firm response" to Trump, and "when he refuses the arrival of refugees, while Europe has done its duty, we have to respond". We should also keep our doors open to refugees and those who need help.
Mohammad Hossein Ziya, who was forced to leave Iran, came to the USA in 2011 and lives in Virginia. While PAAIA and the Iranian American community commend efforts that would enhance our national security, we believe measures based exclusively on national origin are ineffective national security tools and anti-American.
In comments on Saturday, Iranian President Hassan Rouhani said today's world would not tolerate separating peoples. "Even if there are walls between nations, they must be removed", Rouhani said at a tourism convention in Tehran. They have forgotten that the Berlin wall fell years ago. It also halts the issuing of new visas from the seven countries affected.