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Interline Billing Support

Inward Billings

The rules and regulations of interline travel and passenger taxes have added much complexity to the verification process of interline billings. The speed of change in Interline Taxes and airline agreements make it impossible for any airline Revenue Accounting System to recognise and reject 100% of overbillings from interline partners. Our experience to date proves that significant revenue can be generated by ASI for our client airlines through the ASI suite of Interline Billing Support Services.


ASI provides the Billing Verification Services in a number of ways:

  • Prime (1st Pass) audit of the incoming Prime Billings (not audited by client airline)
  • Secondary (2nd Pass) audit of the accepted Prime Billings that the client airline has already audited and accepted as valid billings
  • Verification of Checked or Unchecked Recharges (2nd and 3rd stage)
  • Sampling recheck
  • Correspondence support

Unchecked Prime Billings

A number of airlines use the ASI proration services to clear backlogs or ensure that IATA deadlines are met. Many airlines use thresholds to check inward billings and below a certain threshold billings go unchecked. ASI will work with your airline to ensure there is a 100% check on your inward billings. ASI will check each coupon billing to ensure that the airline client revenue is protected and overbillings in prorates, ISC and interline taxes are highlighted for recovery.

Secondary Check on Accepted Billings

ASI works in partnership with client airlines through the provision of a 2nd pass audit on interline billings. ASI ensures there is no leakage and adds value to the airline bottom line. 

Rebills/ Recharges / FIMs

ASI has the technology and auditors with experience, expertise and intuitive skills to undertake the auditing of recharges and FIMs and Correspondence in order to protect client airline revenue and maximize the recovery from the interline process.

Outward Billings

As part of its quality assurance service to client airlines ASI will review the outward billing file and provide a report to the airline on its accuracy.

In accordance with RAM rules, ASI is aware that under billings on a previously submitted outward file can be recovered by the billing airline through the generation of a Supplementary Billing – if the value of the error on any one coupon is equal or greater than $200 (ACH: $50)

However, the Outward Billing Audit will highlight not just the errors in excess of $200 but also all occasions of under billings that will allow the airline to make corrections to the Revenue Accounting System and thereby avoid future under billings.

ASI is successfully providing this service to a number of ASI clients and substantial savings and system improvements have been made as a direct result of our audit.