flight_01.js

var mongoose = require('mongoose');

module.exports = mongoose.model('Flight', {
  number: Number,
  origin: String,
  destination: String,
  departs: String,
  arrives: String,
  actualDepart: Number,
  actualArrive: Number
});

flight_02.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;

var FlightSchema = new Schema({
  number: Number,
  origin: String,
  destination: String,
  departs: String,
  arrives: String,
  actualDepart: Number,
  actualArrive: Number
});

// Compile a 'Flight' model using the FlightSchema as the structure.
// Mongoose also creates a Mongo collection called 'Flight' for these documents.
var Flight = mongoose.model('Flight', FlightSchema);

flight_03.js

var mongoose = require('mongoose');

var Schema = mongoose.Schema;

var FlightSchema = new Schema({
  number: Number,
  origin: String,
  destination: String,
  departs: String,
  arrives: String,
  actualDepart: Number,
  actualArrive: Number
});

module.exports = mongoose.model('Flight', FlightSchema);