Bookings are subject to manual review. You can only book first leg of flights. When booking one flight please notice you also be assigned the second leg of the flight., if the flight you choosed has two legs. Not all flights have two legs.

Note: First leg of flights terminates with "1". Booking LIS1-1 you will be assigned two flights, LIS1-1 and LIS1-2.
You can choose any callsign you want.