Empty Legs, Deadhead Flights, and Revenue-Mile Apportionment

Not every flight generates revenue. Positioning flights, ferry legs, and deadhead repositioning are a routine part of aircraft operations — but how they are treated for state tax apportionment purposes can have a meaningful impact on an operator's tax liability.

What Is an Empty Leg?

The terms empty leg, deadhead flight, ferry flight, and positioning flight all refer to the same concept: a flight segment flown with no paying passengers or revenue cargo. Common examples include:

• Flying an aircraft back to its home base after dropping off a charter client
• Repositioning a fleet aircraft to meet a scheduled pickup at another city
• Ferry flights after maintenance or for delivery to a new owner
• Deadhead legs where crew travel to or from an assignment without passengers

These flights consume fuel, crew hours, and airspace just like revenue flights — but they generate no direct income. For many operators, empty legs can represent 20–40% of total annual flight hours.

The Two Apportionment Formulas

When a transportation company or aircraft owner files a state corporate income tax return, the state must determine what share of the company's income is taxable in that state. For aviation, this is almost universally done with a mileage-based apportionment fraction:

States fall into two camps regarding how they define "total miles" (the denominator):

Revenue-Mile States

These states define the denominator as revenue miles — miles flown while carrying paying passengers or revenue cargo. Florida is the clearest example: §220.151, Florida Statutes, as implemented by Fla. Admin. Code r. 12C-1.0151, explicitly bases apportionment on "revenue miles in this state" versus "total revenue miles everywhere." Under this framework, an empty positioning leg does not count in either the numerator or the denominator. The flight happened, but it does not factor into the apportionment fraction at all.

The policy rationale is straightforward: apportionment is meant to allocate income-producing activity across states. A flight that produces no revenue produces no income to apportion.

Total-Mile States

Other states use total miles regardless of whether revenue was generated. Under this approach, every flight segment — including empty legs — counts in both the numerator (if it occurred in that state) and the denominator. For operators with heavy positioning activity, this can significantly increase their apportionment percentage in states where they frequently reposition aircraft.

The distinction matters most for operators who do a high volume of repositioning — charter companies, fractional programs, and corporate flight departments that regularly move aircraft without passengers. A 30% empty-leg rate can shift apportionment fractions by several percentage points in affected states.

Why You Must Track Empty Legs Either Way

A common misconception is that operators can simply omit empty legs from their flight records when filing in revenue-mile states. This is the wrong approach. There are several reasons to log every flight segment regardless of whether passengers were aboard:

• Audit trail. State auditors reviewing an apportionment claim will expect to see a complete and continuous flight log. Gaps or inconsistencies between your records and FAA/ADS-B data are audit red flags.
• Multi-state filings. The same flight may be treated differently across states filing in the same period. A flight excluded in Florida (revenue-mile state) may need to be included in another state's total-mile calculation.
• Denominator integrity. In revenue-mile states, empty legs are excluded from the denominator. But to know the correct denominator, you first have to know the total — which means tracking all flights.
• Federal consistency. Federal income tax records and operational logs should reconcile with state filings. Selectively omitting flights creates reconciliation risk.

The Numerator and Denominator Effect

To understand the financial impact, consider a simplified example. An operator flies 500,000 total miles in a year. 150,000 of those miles are empty positioning legs. The operator has 80,000 miles within Florida (including 25,000 empty-leg miles within the Florida Box).

In this example, the difference is modest — but for operators with larger fleets, higher empty-leg ratios, or operating predominantly in revenue-mile states, the cumulative effect across multiple years of filings can be substantial.

How AircraftTaxSoftware.com Handles This

Every flight in AircraftTaxSoftware.com can be flagged as an Empty / Positioning Leg at the time of entry or during import. The flag is available in the flight log form, and in CSV imports via the is_empty_leg column (accepted values: true, yes, 1).

• Flight log: A checkbox on the Add / Edit Flight form clearly marks the flight as carrying no passengers or revenue cargo.
• CSV import: Bulk-imported flight data can include the is_empty_leg column. Rows without the column default to false, so existing imports are unaffected.
• Flight history: Flagged flights display an EMPTY badge in the flight list so operators can visually audit their records at a glance.
• Apportionment reports: The reporting engine applies each state's formula correctly — revenue-mile states exclude flagged flights from both the numerator and the denominator, while total-mile states include all flights.

The result is that operators never have to decide which flights to omit from their records. Log everything. The software applies the right rule for each state automatically.

Practical Guidance for Operators

• Log every segment. Even if a flight is empty, it belongs in your records. The software's empty-leg flag is how you tell the system — not omitting the flight entirely.
• Flag at entry time. It is easier to mark a flight as empty when it is fresh. Retrofitting classifications during audit preparation is time-consuming and error-prone.
• Understand your state mix. If the majority of your revenue flying happens in revenue-mile states, your apportionment exposure from empty legs may be lower than you expect. If you operate heavily in total-mile states, the calculus is reversed.
• Reconcile regularly. Run quarterly apportionment summaries and compare revenue-mile totals against your operational records to catch classification errors before year-end.