Passengers boarding a plane. Washington, D.C. municipal airport. Sourced from the Library of Congress. https://www.rawpixel.com/image/12279463/photo-image-person-plane-public-domainFree Image from public domain licensePassengers disembarking. Washington, D.C. municipal airport. Sourced from the Library of Congress. https://www.rawpixel.com/image/12279453/photo-image-person-sky-airplaneFree Image from public domain licensePassengers boarding an airliner. Municipal airport, Washington, D.C.. Sourced from the Library of Congress. https://www.rawpixel.com/image/12277585/photo-image-person-airplane-public-domainFree Image from public domain licenseOn a rainy day on the field of the municipal airport in Washington, D.C.. Sourced from the Library of Congress. https://www.rawpixel.com/image/12263610/photo-image-person-airplane-public-domainFree Image from public domain license[Untitled photo, possibly related to: Production. B-17 heavy bomber. Tail view of a new B-17F (Flying Fortress) bomber ready… https://www.rawpixel.com/image/12297733/photo-image-plant-person-skyFree Image from public domain licenseThe “Al Fursan” (The Knights), the United Arab Emirates Air Force aerobatic display team, flies in formation behind a U.S.… https://www.rawpixel.com/image/8727840/photo-image-airplane-public-domain-personFree Image from public domain license