NEW YORK (AP) — Boeing Co. is studying different ways to account for pension expenses, which reduced the aerospace company's third-quarter earnings.

Chief Financial Officer Gregory D. Smith said Tuesday that Boeing is considering several options, including making no change.

The options under review include changing to mark-to-market accounting, which would take into consideration changes in the value of pension assets and obligations. It could, however, introduce more swings in earnings reports because the current accounting method spreads out gains and losses from assets over several years.