Whether governed under general laws or charter, a local agency may acquire property by purchase, condemnation, donation, lease, or otherwise for the purposes of this article and may use any real property which it owns or acquires within or without its limits as a site for an airport. The local agency may erect and maintain hangars, mooring masts, flying fields, and places for flying, take-off, landing, and storage of aircraft, together with signal lights, radio equipment, service shops, conveniences, appliances, works, structures, and other air navigation facilities, now known or hereafter invented, of such number and character and in such places as may be necessary or convenient.