The phone number of Grand China Air Airlines Customer service is 312-374-3700. The Grand China Air Airlines Customer Service phone number is the America sales support number. The number is a 24 hours hotline number. For other country hotline customer service number, see the table below. If you are unable to find the contact number or unable to contact the international phone number, send email to email@example.com and the customer service will contact you back in 1-2 business days.