Probably fuel Sean, the Dallas flights are load challenged every day and when there is a possibility of a diversion they need to get more fuel. On a long flight the expected weather can change, triggering the requirement for holding or diversion fuel that didn’t exist prior to departure. Often the precursor is an amended TAF, or terminal area forecast, as there currently is at the time of this post, although this one indicates the issue is in hours, not tomorrow morn:
TAF AMD YSSY 200507Z 2006/2112
12012KT 9999 -SHRA FEW010 SCT030
FM201000 25005KT 9999 FEW025
FM201400 32005KT 9999 SCT005
FM202300 32008KT CAVOK
FM210400 08008KT CAVOK
FM210800 15012KT 9999 FEW010 BKN100
PROB30 TEMPO 2006/2010 VRB30G50KT 2000 TSRA BKN010 SCT040CB
PROB30 2014/2022 4000 BR
RMK
T 27 24 23 22 Q 998 1000 1002 1003
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