Here are the Boeing 737 Max 8 flights out of Philadelphia and what you need to know about them

March 13-- Mar. 13--» UPDATE: Trump: U.S. to ground all Boeing 737 Max 8 and 9 planes after Ethiopian Airlines crash

More travelers are reaching out to U.S. airlines, especially Southwest Airlines and American Airlines, asking to change flights scheduled on 737 Max 8 jets, the type of aircraft that crashed in Ethiopia on Sunday and has since been grounded by a growing number of countries.

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But so far, just a handful of Boeing's new planes are arriving or departing from Philadelphia International Airport. The 737 Max 8 had one arrival and three departures, all on Southwest Airlines and scheduled on Tuesday and Wednesday, according to FlightRadar24.com on Tuesday afternoon.

These include Southwest flight #1029 arriving from Tampa at 5:40 p.m. Wednesday and a scheduled departure Thursday at 7:05 a.m., to Atlanta on flight #2348.

By Wednesday, Southwest was switching some of the flights to older aircraft in the 737 series.

The Federal Aviation Administration says the plane is safe, and so do the U.S. airlines using it. Southwest is running the largest fleet of 737 Max 8 jets, with 34 in service throughout its system, while American has 24 in its fleet. United Airlines flies a slightly larger version, the Max 9. More than 30 airlines operate a total of about 350 737 Max 8s.

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