Delta domestic - Miles earning?

Hi,
Just booked two econ flights MCO-JFK (one-way)for £35.80 each with Delta.
I think they earn miles.
How do we ensure we get the miles, there was nowhere to put our FC numbers on the booking form.
Thanks in advance,
Tim & Chris
Just booked two econ flights MCO-JFK (one-way)for £35.80 each with Delta.
I think they earn miles.
How do we ensure we get the miles, there was nowhere to put our FC numbers on the booking form.
Thanks in advance,
Tim & Chris