TY  - JOUR
T1  - All A.O. 121 and 135 operators
JF  - Philippine Star
LA  - English
YR  - 2000
UL  - https://tuklas.up.edu.ph/Record/IPN-00000013249
KW  - Aviation : Study and teaching
KW  - Philippines. Department of Transportation and Communications. Air Transportation Office : Memoranda, Circulars, etc.
ER  -