According to Flight Plan Completion | SKYbrary Aviation Safety, Fuel Endurance is supported in Item 19 of an ICAO Flight Plan, but SimBrief does not currently include this.
The downside of this: When importing a SimBrief-generated ICAO Flight Plan into VATSIM, this item is missing and has to be entered manually.
Here is an example that includes Fuel Endurance in Item 19:
(FPL-PAC765-IS
-B748/H-SDE3FGHIM1M2RWXY/LB1
-KSFO1730
-N0497F300 DCT SFO DCT BEBOP R464 BILLO/N0494F320 R464 BITTA INOYI1
-PHNL0447 PHTO
-PBN/A1B1D1O1S2 DOF/240302 REG/N749SB EET/KZAK0040 PHZH0407 SEL/BRLR
OPR/PAC PER/D RALT/KSFO PHTO RMK/TCAS
-E/0652)
I’ve confirmed that VATSIM does in fact support the E/ field in Item 19.
Would you please add this to the output generated by SimBrief?
(BTW, yes I am aware that I can file directly from SimBrief and the fuel endurance will be present, but having this in the ICAO Flight Plan is still nice to have and a simple enough task).
Thanks.