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Photo by Darryl Dyck/The Canadian Press

But some passengers are still concerned, with many expressing their reservations about the jet on social media. Flight Centre travel agency told The Canadian Press that the airlines aren’t waiving change fees for customers seeking to rebook their flights on other aircraft.

Financial markets also appeared spooked about the safety of the jet involved in two crashes. Both planes crashed within minutes of take off. While the cause of the Ethiopia crash remains unknown, investigators have retrieved the black box.

Air Canada’s stock price dropped nearly 4 per cent and WestJet’s fell more than 3 per cent on Tuesday.

Shares of Boeing Co., the world’s largest plane maker and best-performing Dow Jones component this year by a wide margin, dropped 6.2 per cent, following loses of 5.3 per cent on Monday.

The 737 MAX jets are Boeing’s most popular aircraft. Orders for the MAX planes surpassed 5,000 last year, according to Boeing’s most recent financial reports.

The mass groundings could cost the company millions per day.

According to research from AirTrav Inc., if the entire 737 MAX fleet is grounded, it could cost more than US$17 million per day. The estimates are based on costs from 2013 when the Boeing 787 Dreamliner was grounded for about 120 days.

If the fleet remains grounded for 30 days, revenue losses could hit $534 million and operating profit could take a $278-million hit. In the scenario of a 120-day grounding, revenue losses could reach $2.1 billion, with operating profit down by $1.1 billion.

For its part, Boeing said it understands that authorities have made grounding decisions that they believe are appropriate for their markets.

“The United States Federal Aviation Administration is not mandating any further action at this time, and based on the information currently available, we do not have any basis to issue new guidance to operators,” Boeing posted on Twitter on Tuesday.

That statement followed a late Monday software update announcement. That change was in response to the Lion Air crash in Indonesia that killed 189 people in October.

“For the past several months and in the aftermath of Lion Air Flight 610, Boeing has been developing a flight control software enhancement for the 737 MAX, designed to make an already safe aircraft even safer,” Boeing stated.