Infrastructure and construction giant the ACS Group is investing $110 million (€103.4 million) in Skyports, the electric drone and vertiport developer backed by Irelandia, the investment firm founded by Declan Ryan. The Spanish-headquartered ACS Group has become the largest investor in the company which is led by Duncan Walker. Irelandia first invested in the company in 2019 as part of its $8 million series A round closed in March 2020 and was among investors in its $23 million series B round in March 2022.  Michael Lynch, partner in Irelandia, said Irelandia remains an investor in Skyports, which signed a major…