The choice is yours, you are not required to purchase early bird check-in or upgrade your seat.
Non-refundable ticket change fee:
Same day change fee
: None but any fare difference will apply
Carry on bag: Free!!!!
1st/2nd checked bag: Free!!!!
Additional bags fee:
$50 each for 3-9 bags; $110 each for more
Overweight bags: $75
$0 (but any fare difference will apply)
Same day change fee:
Depends on type of award and possible point difference
Priority Boarding Fee: Early Bird check-in $12.50; "Upgraded boarding" $40