Sustainable development 3 Sustainable solution Additives 1 Aggregate gradations 1 Aggregates 1 Air mobility 1 Air taxi 1 Air transportation 1 Asphalt 1 Aviation fuel 1 Aviation industry 1 Budget control 1 Civil aviation 1 Critical challenges 1 Economic analysis 1 Economic benefits 1 Economic perspective 1 Economic savings 1 Energy requirements 1 Financial constraints 1 Fossil fuels 1 Global warming 1 High growth-rate 1 Hot-mix asphalt mixtures 1 Housing 1 Lower temperatures 1 Moisture 1 Moisture resistance 1 Planning 1 Semi structured interviews 1