no TAF at YWND, therefore must have alternate
use YKRY which has INTER, therefore, ineligible to be alternate, unless carry extra fuel
INTER means we must carry additional 30 minutes fuel (holding burn rate). If no rate available, use cruise rate.
INTER has buffer, 30 minutes either side, for fuel planning
YBAF has INTER, therefore another 30 minutes fuel
if TEMPO, additional one hour of fuel instead of 30 minutes
see page 12 of Student Training Guide.