A method for manufacturing a gangway, wherein the gangway comprises a plurality of tread supports and an underbody, said method comprising the steps of: providing a first tread support of the plurality of tread supports from a first continuous piece of metal such that the first continuous piece of metal defines a left flange area and a right flange area connected to a tread area, wherein the left flange area and the right flange area are opposite one another with respect to the tread area, the left flange area and the tread area define a first fold line, and the right flange area and the tread area define a second fold line; folding the left flange area with respect to the tread area at the first fold line; folding the right flange area with respect to the tread area at the second fold line; characterized by providing the underbody from a second continuous piece of metal, wherein the second continuous piece of metal defines a left wing area and a right wing area connected to a center area, wherein the left wing area is opposite the right wing area with respect to the center area, the left wing area and the center area define a left wing fold line, and the right wing area and the center area define a right wing fold line; folding the left wing area with respect to the center area at the left wing fold line such that the left wing area becomes a left support of the underbody; folding the right wing area with respect to the center area at the right wing fold line such that the right wing area becomes a right support of the underbody; and connecting one side of the first tread support to the left support and an opposite side of the first tread support to the right support. providing a first tread support of the plurality of tread supports from a first continuous piece of metal such that the first continuous piece of metal defines a left flange area and a right flange area connected to a tread area, wherein the left flange area and the right flange area are opposite one another with respect to the tread area, the left flange area and the tread area define a first fold line, and the right flange area and the tread area define a second fold line; folding the left flange area with respect to the tread area at the first fold line; folding the right flange area with respect to the tread area at the second fold line; characterized by providing the underbody from a second continuous piece of metal, wherein the second continuous piece of metal defines a left wing area and a right wing area connected to a center area, wherein the left wing area is opposite the right wing area with respect to the center area, the left wing area and the center area define a left wing fold line, and the right wing area and the center area define a right wing fold line; folding the left wing area with respect to the center area at the left wing fold line such that the left wing area becomes a left support of the underbody; folding the right wing area with respect to the center area at the right wing fold line such that the right wing area becomes a right support of the underbody; and connecting one side of the first tread support to the left support and an opposite side of the first tread support to the right support.