1.

Engro Chemicals Dharki

From 1981 to 1983
From 1984 to 1987

1554:15

2.

Oil & Gas Development Corporation
(Aircraft based in Islamabad)

From 1982 to 1984

816:15

3.

National Logistic Cell
(Aircraft based in Islamabad)

1984

230:00

4.

Pakistan Petroleum Ltd.

From 1984 to 2003

5500:00

5.

Union Texas Pakistan

From 1985 to 1999
From 1990 to 1999

ASSL was maintaining and flying a Twin Otter DHC6 Aircraft owned by Union Texas Petroleum

3855:00

6.

Deutag Drilling Germany
(Aircraft based in Islamabad)

1992

363:00

7.

Lasmo Oil Pakistan

From 1990 to 1999

6235:45

8.

British Gas
(Aircraft based in Islamabad)

1994

253:00

9.

BHP Billiton Austrialia

2002 till to date

3000:00

10.

Ent Pakistan

2001 till to date

637:00