X0508 4 2025-07-23 0000001750 AAR CORP AIR 0001764537 Gillen Sean M. 1100 N. WOOD DALE ROAD WOOD DALE IL 60191 1 Senior VP-CFO 0 Common Stock 2025-07-23 4 A 0 3815 0 A 88423.203 D Common Stock 2025-07-23 4 A 0 11445 0 A 99868.203 D Common Stock 2025-07-23 4 M 0 8000 18.94 A 107868.203 D Common Stock 2025-07-23 4 S 0 8000 77.374 D 99868.203 D Common Stock 2025-07-23 4 M 0 4000 37.74 A 103868.203 D Common Stock 2025-07-23 4 S 0 4000 77.374 D 99868.203 D Common Stock 2025-07-23 4 M 0 4000 41.88 A 103868.203 D Common Stock 2025-07-23 4 S 0 4000 77.374 D 99868.203 D Common Stock 2025-07-23 4 M 0 2000 58.27 A 101868.203 D Common Stock 2025-07-23 4 S 0 2000 77.374 D 99868.203 D Stock Option 79.45 2025-07-23 4 A 0 10550 0 A 2026-07-31 2035-07-23 Common Stock 10550 10550 D Stock Option 18.94 2025-07-23 4 M 0 8000 0 D 2021-07-31 2030-07-13 Common Stock 8000 39870 D Stock Option 37.74 2025-07-23 4 M 0 4000 0 D 2022-07-31 2031-07-12 Common Stock 4000 3970 D Stock Option 41.88 2025-07-23 4 M 0 4000 0 D 2023-07-31 2032-07-18 Common Stock 4000 8065 D Stock Option 58.27 2025-07-23 4 M 0 2000 0 D 2024-07-31 2033-07-24 Common Stock 2000 4715 D Award of stock pursuant to a Restricted Stock Agreement in a transaction exempt under Rule 16b-3. Award of stock pursuant to a Performance Restricted Stock Agreement in a transaction exempt under Rule 16b-3. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.43 to $79.16 inclusive. The reporting person undertakes to provide AAR CORP., any security holder of AAR CORP., or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote. The awarded stock option vests and becomes exercisable in 1/3 annual installments beginning on July 31, 2026 and shall vest as follows: 33 and 1/3% on each of July 31, 2026, July 31, 2027 and July 31, 2028. The awarded stock option vested and became exercisable in 1/3 annual installments beginning on July 31, 2021 and vested as follows: 33 and 1/3% on each of July 31, 2021, July 31, 2022 and July 31, 2023. The awarded stock option vested and became exercisable in 1/3 annual installments beginning on July 31, 2022 and vested as follows: 33 and 1/3% on each of July 31, 2022, July 31, 2023 and July 31, 2024. The awarded stock option vests and becomes exercisable in 1/3 annual installments beginning on July 31, 2023 and shall vest as follows: 33 and 1/3% on each of July 31, 2023, July 31, 2024 and July 31, 2025. The awarded stock option vests and becomes exercisable in 1/3 annual installments beginning on July 31, 2024 and shall vest as follows: 33 and 1/3% on each of July 31, 2024, July 31, 2025, and July 31, 2026. /s/ Katherine Kwiat, power of attorney 2025-07-25