(1) What is most important to you in a FFP?
Maximum number of domestic award flights. Priority access is nice, too.
(2) How many miles do you usually fly each year & in what class? How many flights/sectors?
Less than 10k (per family member).
(3) What types of fares do you usually buy ?
Cheapest
(4) Can you choose your airlines and/or class of service? Do you travel for work and/or pleasure?
Most flights are on 1-class Eagle. Pleasure.
(5) Which routes do you fly most often
MSN-DFW
(6) What is your home airport?
MSN. MKE is about an hour away.
(7) Do you have FFP status of any kind in OW or other airline? What is it? Do you have any miles banked in a FFP?
No status. Once CC bonuses post, will have ~55k UA miles, 40k US miles, and 40k AA miles.
(8) Preferred Airlines
AA (Eagle) is the only direct flight from MSN to DFW. UA is an acceptable alternative sometimes.

We live in MSN, extended family is in DFW. Me, spouse, two kids. Most mile earn will occur via credit cards and I'm only interested in redeeming for award flights. AA is an obvious choice, but BA distance-based comes out ahead with CC spending (assuming award tickets are available).