Travel in Europe through its well-networked roads and rail is a great way to discover the cities. Air travel costs are at an all-time low thanks to budget airlines. Yet you need to be careful about taxes, payment through credit cards, and the extra cost of food and drinks. Luggage restrictions also apply; for example easyJet allows you 44 pounds of luggage free of charge whereas with British Airways you can carry one piece of luggage of 51 pounds for free.