This article examines how changes in governmental accounting standards over the past two decades have created unintended consequences for airport bond covenants and airline rate calculations. The analysis is based exclusively on publicly available sources including GASB official pronouncements, CPA firm implementation guides, and general knowledge of airport finance structures. No confidential or proprietary data from DWU Consulting client engagements was used. No specific airports are named. Readers should consult their bond counsel and financial advisors before acting on this analysis.
A Devastating Career
Airport financial consulting is a devastating career. An airport financial consultant has a large audience of experts in GAAP accounting, bond documents, and airline agreements — who each knows all about one dimension but may not know as much about the other two. The bond lawyer may not understand how airline rates are calculated. The airline negotiator may not follow the nuances of GASB standards. The government auditor may never have read a bond indenture. Yet all three dimensions interact constantly, and the consultant must work fluently across all of them while translating between audiences who speak fundamentally different languages.
At the same time, the very foundation of airport finance — Generally Accepted Accounting Principles — keeps shifting. GASB improves governmental accounting standards for good and necessary reasons: better transparency, more accurate reporting, fuller disclosure of long-term obligations. But each improvement changes the numbers that flow through bond covenants and airline rate calculations. This creates a messy situation: while airports are navigating a complicated ship through air traffic fluctuations and economic uncertainties, GASB keeps changing the engine.
Three Dimensions, Revisited
As described in Three Dimensions of Airport Finance (2016), every U.S. airport operates under three concurrent sets of rules that often define the same terms differently:
1. GAAP Accounting — Uniform standards applied to all airports. Governs audited financial reporting.
2. Rates and Charges — The airline use agreement or rate resolution, unique to each airport. Governs how much airlines pay.
3. Bond/Trust — The bond document (indenture, resolution, or trust agreement), unique to each airport. Governs debt service protection.
Terms like "Revenues," "Operating Expenses," and "Debt Service" are capitalized in bond documents and airline agreements to indicate that they are defined terms — and those definitions may differ from their GAAP counterparts. The same dollar amount can be treated differently under each system.
The critical question is: how do the bond document and airline agreement define their terms? Some define them independently — listing specific inclusions and exclusions. Others take a shortcut: they reference GAAP. When a bond document says Operating Expenses means "all expenses recognized as operating expenses under generally accepted accounting principles, excluding depreciation," it has hardwired its covenant to GAAP. When GAAP changes, the covenant changes — whether anyone intended it to or not.
Two Decades of GASB Changes
The following table summarizes major GASB pronouncements issued since 2004 that have changed what airports report as operating expenses, operating revenues, or both. Each of these standards was adopted for sound policy reasons. Each also changed the numbers that flow through any bond covenant or airline rate formula tied to GAAP definitions.
| Year Issued | GASB Statement | Subject | Effective FY | Implication for Airport Finance |
|---|---|---|---|---|
| 2004 | GASB 45 | OPEB Accounting | 2007–2008 | Required airports to recognize post-employment benefit obligations beyond pensions. Non-cash OPEB expense appeared in operating expenses for the first time, increasing reported O&M. |
| 2012 | GASB 68 | Pension Accounting | 2014–2015 | Replaced GASB 27. Required net pension liability on the balance sheet. Pension expense now includes volatile non-cash components (changes in proportion, differences between projected and actual earnings) that swing dramatically year to year — completely unrelated to what the airport actually paid its pension system. |
| 2015 | GASB 75 | OPEB (replaced 45) | 2017–2018 | Applied GASB 68’s framework to OPEB. Net OPEB liability on balance sheet. Non-cash OPEB expense now equally volatile — driven by actuarial assumptions, discount rates, and investment returns, not by actual benefit payments. |
| 2017 | GASB 87 | Leases | 2021–2022 | The most devastating blow to operating revenues. For airports as lessors, lease revenue is split: straight-line amortization of deferred inflow (operating) plus interest income on the lease receivable (nonoperating). A $30M/year ground lease now produces only ~$24M in operating revenue. Massive administrative burden to implement. First standard to make GAAP operating revenues potentially unfit for rate covenant and airline rate calculations. |
| 2020 | GASB 94 | Public-Private Partnerships | 2022–2023 | New recognition rules for PPP and service concession arrangements. Some auditors have begun questioning whether terminal concession agreements — traditionally treated as operating leases or license agreements — may qualify as service concession arrangements under GASB 94, potentially triggering different recognition treatment for one of airports’ largest non-airline revenue streams. |
| 2020 | GASB 96 | SBITA | 2022–2023 | IT subscription payments (cloud software, SaaS contracts) reclassified from operating expense to right-of-use asset amortization plus interest — same treatment as GASB 87 leases. Airports with large technology platforms see operating expenses decrease and amortization increase. |
| 2024 | GASB 103 | Financial Reporting Model | 2025–2026 | Redefines operating vs. nonoperating. Establishes five explicit categories of nonoperating items and a new required subtotal. Items previously classified as operating may shift to nonoperating (or vice versa), changing what counts as “Operating Revenues” and “Operating Expenses” in the audited financial statements. |
Seven major standards in twenty years. Each one well-intentioned. Each one changing the financial landscape that airport bond covenants and airline rate formulas were built upon.
Acknowledging the Good Intentions
These standards addressed real problems. Before GASB 45 and 68, governments could promise billions in retirement benefits without reporting the obligations on their financial statements — a massive transparency gap. GASB 87 corrected the longstanding inconsistency of keeping lease obligations off-balance-sheet while reporting the assets those leases funded. GASB 96 closed the gap between traditional leases and modern subscription-based technology arrangements. GASB 103 tackled years of inconsistent operating vs. nonoperating classification that made cross-entity comparison nearly impossible.
The accounting profession should be commended for these improvements. They make government financial statements more complete, more transparent, and more comparable. The problem is not with the standards themselves — it is with the documents that reference them.
The Hard Link Problem
Many airport bond documents and airline use agreements define their key financial terms by reference to GAAP. A bond indenture might say:
This definition worked in 2005. GAAP operating expenses at an airport were relatively stable: salaries, benefits, contractual services, utilities, materials, insurance — the cash costs of running the facility. But starting in 2007, GASB began adding non-cash items to operating expenses.
Here is what happened, step by step:
GASB 45/68/75 — Pension and OPEB. GAAP operating expenses now include non-cash pension and OPEB expense — the difference between the actuarially determined contribution and the actual payment, plus actuarial adjustments for assumption changes, investment experience, and demographic experience. These non-cash components can swing by tens of millions of dollars year over year at a large airport. In a good investment year, non-cash pension expense might be negative (reducing total operating expenses). In a bad year, it might spike to three or four times the actual cash contribution. If the bond document defines Operating Expenses by reference to GAAP, this volatility flows directly into the coverage calculation — not because the airport spent more money, but because an actuary changed an assumption or the pension fund's investments had a bad quarter.
For airports that pre-fund their OPEB obligations through irrevocable trusts, the full accrual expense is a real cash outlay and arguably belongs in Operating Expenses. But for airports that pay OPEB on a pay-as-you-go basis — which many airports do — the non-cash component is purely an accounting construct with no cash flow impact. If the bond document's Operating Expenses definition sweeps it in because "GAAP says so," the rate covenant test becomes a function of actuarial assumptions rather than operational performance.
GASB 87 — The Most Devastating Blow to Operating Revenues. Of all the GASB changes in the last two decades, GASB 87 may have dealt the single most damaging blow to airports’ GAAP operating revenue figures. The damage comes from three directions simultaneously.
First, the administrative burden is enormous. Every lease an airport is party to — as lessee or lessor — must be identified, measured at present value, and tracked with a new amortization schedule. For a large airport with hundreds of tenant leases, ground leases, equipment leases, and office leases, implementation consumed months of staff time and required new accounting software.
Second, and far more consequential: GASB 87 is the first standard that made GAAP operating revenues potentially unfit for rate covenant and airline rate calculations. For airports as lessors — which is the revenue side of the equation — the standard fundamentally changes how lease revenue is recognized. Before GASB 87, a ground lease with $30 million in annual fixed payments produced $30 million in operating revenue. Straightforward. After GASB 87, the airport records a lease receivable (the present value of all future payments) and a deferred inflow of resources at lease inception. Each year, the airport recognizes two components: (a) straight-line amortization of the deferred inflow, reported as operating revenue, and (b) interest income on the lease receivable, reported as nonoperating revenue. The cash payment is unchanged. The classification is not.
Third, for long-term leases with significant annual revenues, the distortion is material. Consider a concrete example: a 10-year ground lease with $30 million in fixed annual payments, discounted at 4%.
| Before GASB 87 | After GASB 87 (Year 1) | After GASB 87 (Year 10) | |
|---|---|---|---|
| Cash received | $30.0M | $30.0M | $30.0M |
| Operating revenue (deferred inflow amortization) | $30.0M | $24.3M | $24.3M |
| Interest income (nonoperating) | — | $9.7M | $1.2M |
| Reduction in GAAP operating revenue | — | −$5.7M (19%) | −$5.7M (19%) |
The present value of $30 million per year for 10 years at 4% is approximately $243 million. The deferred inflow is amortized straight-line: $243M ÷ 10 = $24.3 million per year in operating revenue. The remainder — $5.7 million in Year 1, declining to $5.7 million in Year 10 — appears as interest income below the operating line. Operating revenue drops permanently from $30 million to $24.3 million. The airport receives the same cash. Its GAAP operating revenue is 19% lower.