They're also reasonably good about releasing first class award space, though it's not as much of a guarantee. (travelsort.com)
Although some carriers don't release a lot of business or first class award space in advance, they usually release at least a few seats. (rewardexpert.com)
Your best bet for finding first class award space is to start searching as soon as you have an idea of your travel dates and keep checking regularly. (upgradedpoints.com)