Amex Travel's fixed points redemption offer, despite the name, can offer different point redemption values.
I've received 1x value for some bookings; 1.6x or higher for others.
Typically longer flights have given me better value.

For example, I was able to use 50,000 points for $800 in value.
But a flight worth $343.27 would cost 34327 points.
Try a few test bookings to see some valuations.