Merge pull request #1 from gprivera/master

edited ERD: TABLES and Field name
Added look-up tables airway_types and scheduled_services
Merge pull request #1 from gprivera/master

Pull request trial: Added look-up tables airway_types and scheduled_services
Merge pull request #2 from gprivera/branch1

Added look-up tables airway_types and scheduled_services
Merge pull request #2 from airishkid/master

Look-up, look-up
Merge pull request #3 from gprivera/branch1

Branch1