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Predicting flight delay propagation in the Brazilian aviation network with Heterogeneous Graph Neural Networks. In Anais Estendidos do XLI Simpósio Brasileiro de Bancos de Dados, setembro 08, 2026, São Carlos/SP, Brasil. SBC, Porto Alegre, Brasil, 405-414. DOI: https://doi.org/10.5753/sbbd_estendido.2026.249492.