text: function Airport(input) {
    this.planes = [];
    this.limit = input;
    this.weather = new Weather;
  }
  // var planes = [];
  Airport.prototype.land = function(plane) {
    if (this.weather.checkWeather() === false) {
      throw new Error("is stormy");
    }
    else if (this.planes.length  >= this.limit) {
      throw new Error("Airport is full");
    }
    else {
      return this.planes.push(plane);
    }
  
  };
  