Optional add-on products and fees that airlines sell separately from the base fare, including checked baggage, seat selection, priority boarding, onboard meals, and schedule flexibility, which collectively generate over $157 billion annually for the global airline industry.
Ancillary services are optional travel products sold separately from the base airfare, transforming what was once an all-inclusive ticket into a modular pricing model where travelers pay only for the features they use. For corporate travel programs, ancillary spend represents a fast-growing and often poorly tracked budget category.
Global airline ancillary revenue reached a projected $157 billion in 2025, up from $148.4 billion in 2024, and now accounts for 15.7% of total airline revenue, compared to just 9.1% in 2016 [1].
The primary ancillary categories are a la carte purchases (baggage, seats, food), commission-based products (hotels, car rentals sold through the airline), and loyalty program revenue (frequent flyer miles sold to credit card issuers).
Navan captures ancillary purchases within the booking flow and categorizes them separately from base fare in expense reporting, giving finance teams visibility into true trip cost beyond the ticket price.
For business travelers, ancillary decisions (seat selection, baggage, lounge access) are often made independently of the initial booking, creating expense tracking blind spots that policies need to address explicitly.
What Are Ancillary Services?
Ancillary services are optional products and fees that airlines sell in addition to the base airfare. They include physical products (checked bags, onboard meals, extra legroom seats), service upgrades (priority boarding, lounge access, schedule flexibility), and third-party offerings sold through the airline's platform (hotel bookings, car rentals, travel insurance).
The term "ancillary" literally means supplementary or secondary. In aviation, it describes everything that was historically included in a standard ticket but has been unbundled into separately priced components. A basic economy fare class might include only the seat and a personal item, with every additional service available for purchase.
This unbundling accelerated after airline deregulation created intense fare competition. Rather than competing solely on base ticket price, carriers began separating services so price-sensitive travelers could buy the minimum while service-focused travelers could customize their experience. The result: lower base fares for those who don't need extras, and significant revenue from those who do.
Categories of Airline Ancillary Services
Ancillary revenue falls into three distinct categories, each with different implications for corporate travel budgets.
Hotel bookings, car rentals, activities sold through airline
Airline earns commission from supplier
May bypass corporate preferred suppliers
Loyalty programs
Frequent flyer miles sold to credit card partners
Airline sells points/miles to financial institutions
Affects employee loyalty program participation
Baggage fees remain the single largest a la carte revenue source globally, but seat selection fees have grown rapidly and now rival baggage at many carriers. Wi-Fi and onboard connectivity represent the fastest-growing category as business travelers increasingly treat connectivity as essential rather than optional.
How Ancillary Services Affect Corporate Travel Budgets
The unbundled pricing model creates three specific challenges for travel managers.
Hidden trip cost. A flight that appears to cost $400 may actually cost $500-600 once a checked bag ($35-70 each way), seat selection ($15-50), and Wi-Fi ($10-25) are added. If policy only tracks base fare, the actual cost of business travel is systematically understated in reporting.
Policy gray zones. Which ancillary services are legitimate business expenses? Checked baggage for a week-long trip is clearly reimbursable. But what about an extra-legroom seat on a 90-minute domestic flight? Priority boarding? Onboard premium snacks? Without explicit guidance, employees make inconsistent decisions and finance teams spend time adjudicating disputes.
Booking fragmentation. Travelers may book their flight through the corporate booking tool but purchase ancillaries directly through the airline's app or at the airport. These purchases bypass corporate tracking systems entirely, creating expense reconciliation gaps that surface only when employees submit receipts weeks later.
How to Build Ancillary Services into Travel Policy
Effective policies address ancillaries explicitly rather than leaving them to individual judgment.
Define reimbursable ancillaries by flight duration. A common framework: checked baggage always reimbursable; seat selection reimbursable on flights over 4 hours; Wi-Fi reimbursable on flights over 2 hours when working; premium meals reimbursable on international flights only. This creates clear rules while acknowledging that needs vary by trip type.
Set per-trip ancillary budgets. Rather than approving or rejecting individual items, some companies allocate a fixed ancillary budget per trip (e.g., $75 domestic, $150 international). Travelers choose how to spend it without needing line-item approval.
Capture ancillaries in the booking flow. When travelers add services during initial booking through a managed platform, the costs are automatically categorized and policy-checked. When they add services later through the airline directly, those costs become harder to track and control.
Ancillary services have transformed from a marginal revenue source to a core component of airline economics. IdeaWorksCompany data shows ancillary revenue grew from $67.4 billion globally in 2016 to $157 billion in 2025, a 133% increase in under a decade [1]. The share of total revenue attributable to ancillaries rose from 9.1% to 15.7% over the same period.
For corporate travel programs, this shift means that base fare comparisons between carriers are increasingly misleading. A carrier with a $50 lower base fare but higher ancillary fees for services the traveler will definitely use (checked bag, seat selection) may actually cost more all-in. Total trip cost comparison must include expected ancillary spend.
The trend shows no sign of reversing. As distribution technology improves and airlines can offer more personalized ancillary bundles at the point of booking, the range of purchasable extras continues to expand. Airport lounge day passes, gate upgrades, companion seat blocking, and real-time upgrade auctions represent newer ancillary categories that further blur the line between base fare and total trip cost.
When Should Business Travelers Skip Ancillary Purchases?
Not every ancillary service delivers value proportional to its cost.
Short domestic flights. On flights under 2 hours, paid seat selection rarely justifies the cost for an able-bodied traveler unless window/aisle preference is essential for working. The time in the seat is too brief for positioning to meaningfully affect productivity.
Carry-on sufficient trips. For 1-2 night business trips, a carry-on bag typically suffices. Paying for checked baggage adds cost and introduces a 15-30 minute delay at baggage claim that extends total travel time.
Redundant connectivity. On flights with free messaging (increasingly common), paying for full Wi-Fi access is unnecessary unless the traveler needs to access large files or join video calls. Free messaging handles most urgent business communication.
Status-provided services. Frequent business travelers often have airline status that includes complimentary checked bags, priority boarding, and seat selection. Paying for services already included through loyalty status is a pure waste that policies should explicitly prevent.
Related Terms
Seat Assignment: The process of selecting a specific seat on an aircraft, which has evolved from a free service to one of the most common ancillary revenue sources as airlines charge for preferred positions.
Fare Class: The booking category that determines which ancillary services are included in the ticket versus sold separately, with basic economy classes typically bundling the fewest complimentary extras.
Priority Boarding: An ancillary service allowing passengers to board the aircraft before general boarding groups, valued by business travelers who need overhead bin space for carry-on luggage.
Frequently Asked Questions About Ancillary Services
The most common are checked baggage (the single largest ancillary revenue source), seat selection (choosing a specific seat or upgrading to extra legroom), priority boarding, onboard Wi-Fi, inflight meals and beverages, schedule change flexibility (the ability to modify flights without penalties), and lounge access passes. Each airline bundles these differently across its fare classes.
For a typical domestic business trip, ancillary fees add $50-150 per round trip when including one checked bag ($35-70 each way), seat selection ($15-50), and Wi-Fi ($10-25 per flight). International trips may add $100-300+ with additional baggage, longer Wi-Fi sessions, and premium seat selections on long-haul flights. These costs are often invisible in base-fare-only reporting.
No. Effective policies distinguish between productivity-essential ancillaries (checked baggage for multi-day trips, Wi-Fi for working flights, connectivity for urgent needs) and comfort preferences (premium meals, extra legroom on short flights, priority boarding). The first category should be fully reimbursable; the second may be partially covered or left to employee discretion within a per-trip budget cap.
Three approaches work: booking all ancillaries through the managed travel platform during initial reservation (they're captured automatically), requiring employees to submit ancillary receipts separately from the base ticket, or using corporate card transaction data to identify airline charges that exceed the original ticket amount. Navan categorizes ancillary purchases separately from base fare in spend reports, providing clear visibility into total trip cost breakdown.
Unbundling allows airlines to offer lower base fares (attracting price-sensitive travelers) while generating revenue from travelers willing to pay for extras. The economic logic: a $300 all-inclusive ticket loses to a $250 base fare in search results, even if the $250 ticket becomes $320 after adding bags and seats. Airlines found that most travelers compare base fares, making unbundled pricing competitively advantageous.
Yes, significantly. Elite status typically includes complimentary checked bags (1-3 depending on tier), priority boarding, preferred seat selection, and sometimes lounge access. For frequent business travelers, these status benefits effectively eliminate the most common ancillary fees. Travel policies should account for status benefits when calculating expected trip costs and avoid reimbursing services an employee already receives free through status.
Accrual accounting is a method of recording financial transactions when they occur, regardless of when the cash transactions happen, ensuring that revenue and expenses are matched in the period they arise.
