Discovery Air ("DA"), founded and incorporated in 2004, is a specialized aviation company that operates primarily in Canada. Through its subsidiary companies, Discovery Air provides aviation and aviation related services for both corporate customers as well as the Federal and Provincial governments of Canada. The Discovery Air operating units provide both fixed-wing and rotary-wing services as well as logistics and remote operations management services. This includes cargo and passenger air charter services throughout Canada, vital medivac air services in the north and utility flying for mining exploration. The Discovery Air business units also provide specialized services to provincial governments with forest fire detection and suppression as well as providing airborne training and special mission services to the Canadian Army, Royal Canadian Navy and Royal Canadian Air Force. Discovery Air also provides a range of maintenance, repair and overhaul services to airline customers through Discovery Air Technical Services, based in Quebec City.

Public service is a service which is provided by government to people living within its jurisdiction, either directly (through the public sector) or by financing provision of services. The term is associated with a social consensus (usually expressed through democratic elections) that certain services should be available to all, regardless of income. Even where public services are neither publicly provided nor publicly financed, for social and political reasons they are usually subject to regulation going beyond that applying to most economic sectors. Public policy when made in the public's interest and motivations can provide Public services. Public service is also a course that can be studied at a college and/or university. Examples of public services are the fire brigade, police, army, and paramedics.