**Atlantic Insurance Company**

**Effective:** 5/21/79

This endorsement forms a part of Policy No. 462 01 2623

(As the same stated in the policy)

Issued to:

International Business Machines Corp.

by Centennial Insurance Company

(The information provided above is required to be completed only when this endorsement is issued for an add-on to the policy subsequent to its effective date.)

**Aircraft Endorsement**

It is agreed that this policy shall not apply to any liability for personal injury or property damage arising out of the ownership, maintenance, operation, use, loading or unloading of any aircraft, unless such liability is covered by valid and collectible underlying insurance as described in the schedule of underlying insurance, and then only for such hazards for which coverage is afforded under said underlying insurance.

It is further agreed that exclusion (d)(2) is amended accordingly.

**JVM:sh**
**4/4/80**

All other terms and conditions of this insurance remain unchanged.

**John J. Markowski**
President

**James V. H. Langbein**
Authorized Representative