Yes I read that the first time; my experience has been different.
The most troublesome segment on my last trip (YYZ/ORD/LAX/AKL) resulted in a waitlist for F enroute ORD (confirmed Y). Otherwise, availability was not an issue (travelled in high season).
AC hasn't been too bad either (YYZ/HNL/SYD). Perhaps it's because I planned my trips well in advance.
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Steve