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AFDX (Avionics Full Duplex Switched Ethernet) standardized as ARINC 664 is a major upgrade for avionics systems. But network delay analysis is required to evaluate end-to-end delay's upper bounds. The Network Calculus approach, that has been used to evaluate such end-to-end delay upper bounds for certification purposes, is shortly described. The Trajectory approach is an alternative method that can be applied to an AFDX avionics network. We show on an industrial configuration, in which cases the Trajectory approach outperforms the existing end-to-end delays upper bounds and how the combination of the two methods can lead to an improvement of the existing analysis.