The image below is a schematic flow diagram of a typical oil refinery that depicts the various unit processes and the flow of intermediate product streams that occurs between the inlet crude oil feedstock and the final end products.
In order to check-in into a hotel, the person must be 21 years old.  If the person is younger than 21, then a parent or guardian can  give permission for them to check-in. 1 person found this useful.
You must be checked in at least 30 minutes before your scheduled departure time. Additionally, you are required to be at the gate and ready to board at least 15 minutes before your scheduled departure time.