##### 



Exhibit 4

40-F CERTIFICATION

AIR CANADA
SARBANES-OXLEY ACT SECTION 302(a) CERTIFICATION

I, Robert A. Milton, certify that:



|1. |  | I have reviewed this annual report on Form 40-F of Air Canada;                                                                                                                                                                                                                                                          
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|2. |  | Based on my knowledge, this annual report does not contain any untrue
statement of a material fact or omit to state a material fact necessary
to make the statements made, in light of the circumstances under which
such statements were made, not misleading with respect to the period
covered by this annual report;
|  
|3. |  | Based on my knowledge, the financial statements, and other financial
information included in this annual report, fairly present in all
material respects the financial condition, results of operations and
cash flows of the registrant as of, and for, the periods presented in
this annual report;                   
|  
|4. |  | The registrants other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and
have:                                                                                                   



| | a) |  | Designed such disclosure controls and procedures to ensure that
material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this annual report
is being prepared;
| | -- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | b) |  | Evaluated the effectiveness of the registrants disclosure
controls and procedures as of a date within 90 days prior to the
filing date of this annual report (the Evaluation Date); and                                                                                                  
|
| | c) |  | Presented in this annual report our conclusions about the
effectiveness of the disclosure controls and procedures based on our
evaluation as of the Evaluation Date;                                                                                                                        



|5. |  | The registrants other certifying officer and I have disclosed, based
on our most recent evaluation, to the registrants auditors and the
audit committee of registrants board of directors (or persons
performing the equivalent functions):
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a) |  | All significant deficiencies in the design or operation of
internal controls which could adversely affect the registrants
ability to record, process, summarize and report financial data and
have identified for the registrants auditors any material weaknesses
in internal controls; and
| | -- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | b) |  | Any fraud, whether or not material, that involves management or
other employees who have a significant role in the registrants
internal controls; and                                                                                                                                        



|6. |  | The registrants other certifying officer and I have indicated in
this annual report whether there were significant changes in internal
controls or in other factors that could significantly affect internal
controls subsequent to the date of our most recent evaluation, including
any corrective actions with regard to significant deficiencies and
material weaknesses.
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Date: May 28, 2003

/s/ Robert A. Milton

---

Robert A. Milton
President & Chief Executive Officer
(Principal Executive Officer)






---



##### 



CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350
AS ADOPTED PURSUANT TO SECTION 906
OF THE SARBANES-OXLEY ACT OF 2002

I, Robert A. Milton, Chief Executive Officer of Air Canada (the
Company), do hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my
knowledge:



| |                                                                                                                                                                                                                                                                        
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | (i) the annual report on Form 40-F of the Company for the year ended
December 31, 2002, as filed with the Securities and Exchange Commission
(the Report), fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934; and



| |                                                                                                                                                          
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------
| | (ii) the information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company.

Date: May 28, 2003

/s/ Robert A. MiltonRobert A. MiltonChief Executive Officer(Principal Executive Officer)


A signed original of this written statement required by Section 906 has
been provided to the Company and will be retained by the Company and furnished
to the Securities and Exchange Commission or its staff upon request.





---



##### 



40-F CERTIFICATION

AIR CANADA
SARBANES-OXLEY ACT SECTION 302(a) CERTIFICATION

I, M. Robert Peterson, certify that:



|1. |  | I have reviewed this annual report on Form 40-F of AIR CANADA;                                                                                                                                                                                                                                                          
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|  
|2. |  | Based on my knowledge, this annual report does not contain any untrue
statement of a material fact or omit to state a material fact necessary
to make the statements made, in light of the circumstances under which
such statements were made, not misleading with respect to the period
covered by this annual report;
|  
|3. |  | Based on my knowledge, the financial statements, and other financial
information included in this annual report, fairly present in all
material respects the financial condition, results of operations and
cash flows of the registrant as of, and for, the periods presented in
this annual report;                   
|  
|4. |  | The registrants other certifying officer and I are responsible for
establishing and maintaining disclosure controls and procedures (as
defined in Exchange Act Rules 13a-14 and 15d-14) for the registrant and
have:                                                                                                   



| | a) |  | Designed such disclosure controls and procedures to
ensure that material information relating to the registrant,
including its consolidated subsidiaries, is made known to us by
others within those entities, particularly during the period in
which this annual report is being prepared;
| | -- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | b) |  | Evaluated the effectiveness of the registrants
disclosure controls and procedures as of a date within 90 days
prior to the filing date of this annual report (the Evaluation
Date); and                                                                                                  
|
| | c) |  | Presented in this annual report our conclusions about the
effectiveness of the disclosure controls and procedures based on
our evaluation as of the Evaluation Date;                                                                                                                        



|5. |  | The registrants other certifying officer and I have disclosed, based
on our most recent evaluation, to the registrants auditors and the
audit committee of registrants board of directors (or persons
performing the equivalent functions):
|-- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



| | a) |  | All significant deficiencies in the design or operation of
internal controls which could adversely affect the registrants
ability to record, process, summarize and report financial data and
have identified for the registrants auditors any material weaknesses
in internal controls; and
| | -- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|
| | b) |  | Any fraud, whether or not material, that involves management or
other employees who have a significant role in the registrants
internal controls; and                                                                                                                                        



|6. |  | The registrants other certifying officer and I have indicated in
this annual report whether there were significant changes in internal
controls or in other factors that could significantly affect internal
controls subsequent to the date of our most recent evaluation, including
any corrective actions with regard to significant deficiencies and
material weaknesses.
|-- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Date: May 28, 2003

/s/ M. Robert Peterson

---

M. Robert Peterson
Executive Vice Present & Chief Financial Officer
(Principal Financial Officer)






---



##### 



CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350
AS ADOPTED PURSUANT TO SECTION 906
OF THE SARBANES-OXLEY ACT OF 2002

I, M. Robert Peterson, Chief Financial Officer of Air Canada (the
Company), do hereby certify, pursuant to 18 U.S.C. Section 1350, as adopted
pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to my
knowledge:



| |                                                                                                                                                                                                                                                                        
| | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
| | (i) the annual report on Form 40-F of the Company for the year ended
December 31, 2002, as filed with the Securities and Exchange Commission
(the Report), fully complies with the requirements of Section 13(a) or
15(d) of the Securities Exchange Act of 1934; and



| |                                                                                                                                                          
| | ---------------------------------------------------------------------------------------------------------------------------------------------------------
| | (ii) the information contained in the Report fairly presents, in all
material respects, the financial condition and results of operations of the
Company.

Date: May 28, 2003

/s/ M. Robert PetersonM. Robert Peterson
Chief Financial Officer
(Principal Financial Officer)


A signed original of this written statement required by Section 906 has
been provided to the Company and will be retained by the Company and furnished
to the Securities and Exchange Commission or its staff upon request.