This is the first day of the game and according to the rules you can only place two orders during the first day and you have already done this. You cannot buy/order any more aircraft until the simulation time starts and day changes.
I had thought the limit of aircraft that can be ordered on the first day was 2 aircraft, to make it fair for all. Which is what I did, so I was surprised to see other airlines able to order more than two aircraft - 4 and 6 for example.
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