The precursors to international airports were airfields or aerodromes. The area has four international commercial airports, and multiple smaller aerodromes for general aviation. That means that all airports are aerodromes, but not all aerodromes are airports. It contains information on all registered Canadian and certain Atlantic aerodromes and certified airports. Private airport fire services in the UK protect all categories of airports and aerodromes. The City of Eldoret is served by two aerodromes, Eldoret International Airport and Eldoret Airstrip. That is to say, all airports are aerodromes, but not all aerodromes are airports. Attacks were to be made on German billets, railways, aerodromes and infantry counter-attacks. Since 1943/1944 there have been measurements by meteorological stations at aerodromes. ZZZZ is a pseudo-code, used in flight plans for aerodromes with no ICAO code assigned. The various civilian aerodromes listed in this section remain unclassified. Allied bombers began a campaign to destroy the German planes on their aerodromes. Night time bombing raids were also conducted, attacking oil installations, power stations, and aerodromes. These bases controlled a number of satellite air fields, including maneuver and alternate aerodromes. Walmer remained on the emergency landing list of aerodromes.