Adam saw that nobody volunteered to come with him and John, it was probably for the best since it would be a dangerous mission and he didn't want to be responsible for an untrained metahuman getting hurt under his supervision. He didn't want to have another tragedy on his hands. 

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After they got to the airport, John growled at the pilot who seemed to have a scared reaction to his appearance and he didn't like people like that. But even the man's reaction didn't ruin his excitement to be getting some more action, ever since he had come out of obscurity John was more interested in doing dangerous missions, they made his blood run hot with the thrill of danger and he liked it.