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On their main website it says,
5 points on airfare purchases
1 point on all other purchases
On the premium rewards center website it says,
5 points for every $1 on Net New Purchases you make specifically with airlines
1 point per dollar spent on all other purchases
Does buying a ticket through Priceline or other travel services count?
The terms are always the place to go for answers to questions such as this. This link is provided on their site:
https://www.penfed.org/Amex-Benefits/
You will earn 5 Points per $1 of Net New Purchases you make specifically with airlines. Bundled vacation packages purchased online, with travel agency or any other entity will not qualify for earning points at this level.