我的代码中需要冒号，但我收到了错误

如何解决我的代码中需要冒号，但我收到了错误

我尝试创建一个子例程并得到一个错误，提示在 if typeOfAircraft = 1: 行中需要冒号。我该如何解决？

def flightPlan():

    typeOfAircraft = int(input(' PLease enter the type of aircraft to be used. \n 1.Medium Narrow Body \n 2. Large Narrow Body \n 3. Medium Wide Body \n choice:'))
    while typeOfAircraft != 1 or typeOfAircraft != 2 or typeOfAircraft != 3:
        print('Error - wrong input')
        typeOfAircraft = int(input(' PLease enter the type oaircraft to be used. \n 1.Medium Narrow Body \n 2. Large Narrow Body \n 3. Medium Wide Body \n choice:'))
    print('Running cost per seat per 100 km     Maximum flight range    Capacity if all seats are standard-class    Minimum number of first-class seats (if there are any)')
    if typeOfAircraft = 1:
        print('it worked')