answer: #Person1# and #Person2# choose a midnight plane because it is cheap and they think they have enough time to catch the flight.
documents: #Person1#: Have you booked the train tickets?
  #Person2#: Yes, the train leaves 4 o'clock and arrives at London at about 10.
  #Person1#: What about the plane tickets from London to Paris?
  #Person2#: Well, I want your advice. If we take the plane, leaving at midnight, we'll have to pay 260 pounds each. But if we leave at 8 in the morning, we'll have to pay 410.
  #Person1#: Can we get to the airport at 11?
  #Person2#: Yes, it's only 30 minutes from the railway station to the airport.
  #Person1#: Then we'll take the plane, leaving at midnight.