Basic Economy / Main Cabin (Economy) Economy PER PASSENGER
On the plain
1 carry-on up to 56 × 36 × 23 cm plus 1 personal item up to 45 × 35 × 20 cm — free on every fare including Basic Economy (no published carry-on weight limit).
Checked in
Usually no free checked bag on domestic Economy — first bag roughly $40–$45, second roughly $55, each way (confirm on aa.com). Many transatlantic Main Cabin fares include 1 free bag; Basic Economy usually does not. Max 23 kg / 158 cm per bag.
Premium Economy / Business / First Premium Economy / Business / First PER PASSENGER
On the plain
1 carry-on plus 1 personal item.
Checked in
Free checked bags included (typically up to 32 kg / 158 cm each) — number varies by cabin and route.