Neb. Rev. Stat. § 3-310

(1) No airport zoning regulations adopted under the Airport Zoning Act shall require the removal, lowering, or other change or alteration of any existing structure or tree not conforming to the regulations when adopted or amended or otherwise interfere with the continuance of any nonconforming use, except as provided in section 3-311 . (2) Any structure that has not yet been constructed but that has received, prior to August 1, 2013, zoning approval from the political subdivision exercising zoning jurisdiction over such structure may be constructed and shall thereafter be considered an existing structure for purposes of this section.