**Exhibit 31.4**
**CFO CERTIFICATION**
I, Derek J. Kerr, certify that:
1. I have reviewed this Quarterly Report on Form 10-Q of US Airways, Inc.;
2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state amaterial fact necessary to make the statements made, in light of the circumstances under which such statements weremade, not misleading with respect to the period covered by this report;
3. Based on my knowledge, the financial statements, and other financial information included in this report,fairly present in all material respects the financial condition, results of operations and cash flows of the registrantas of, and for, the periods presented in this report;
4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosurecontrols and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financialreporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:
(a) Designed such disclosure controls and procedures, or caused such disclosure controls and proceduresto be designed under our supervision, to ensure that material information relating to the registrant,including its consolidated subsidiaries, is made known to us by others within those entities, particularlyduring the period in which this report is being prepared;
(b) Designed such internal control over financial reporting, or caused such internal control overfinancial reporting to be designed under our supervision, to provide reasonable assurance regarding thereliability of financial reporting and the preparation of financial statements for external purposes inaccordance with generally accepted accounting principles;
(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented inthis report our conclusions about the effectiveness of the disclosure controls and procedures, as of the endof the period covered by this report based on such evaluation; and
(d) Disclosed in this report any change in the registrant’s internal control over financial reportingthat occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter inthe case of an annual report) that has materially affected, or is reasonably likely to materially affect, theregistrant’s internal control over financial reporting; and
5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation ofinternal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’sboard of directors (or persons performing the equivalent functions):
(a) All significant deficiencies and material weaknesses in the design or operation of internal controlover financial reporting which are reasonably likely to adversely affect the registrant’s ability to record,process, summarize and report financial information; and
(b) Any fraud, whether or not material, that involves management or other employees who have asignificant role in the registrant’s internal control over financial reporting.
Date: October 23, 2008
**/**s/ Derek J. Kerr