I will be traveling from SFO-IST in business class. When do the check-in desks open? And I have a separate ticket on Turkish from FCO to IST, in business class. Would anyone know when the check-in desks open? We are a party of five traveling with luggage and seniors so want to make certain that we leave enough time.

Our departure out of SFO is at 12:50 pm. Our departure from FCO departs at 6:55 am.

Thank you for your help.