Airbnb (NASDAQ: ABNB) delivered a Q2 that was both in line with elevated expectations and quietly more interesting than the headline beat suggests. Revenue of $3.6 billion grew 17% year-over-year, edging past the $3.58 billion consensus, while adjusted EBITDA margin expanded 100 basis points to 35%. The company raised full-year revenue growth guidance to at least mid-teens and lifted its adjusted EBITDA margin target to at least 35.5%, up from the prior outlook.
The headline numbers are strong. The real story is in the operating leverage emerging from Airbnb's AI investments. Customer support cost per booking declined 16% year-over-year, and the company's AI assistant now resolves 45% of issues without human intervention. This is not a one-time efficiency gain; it is a structural cost advantage that should compound as the AI assistant handles a broader range of issues and as the company introduces an AI voice assistant later this year. The support cost line is small relative to total expenses, but the trajectory matters: if Airbnb can sustain this rate of improvement, the margin expansion baked into the raised guidance looks achievable without aggressive spending cuts elsewhere.
Nights and Seats Booked accelerated to 10% year-over-year growth, up from 9% in Q1, driven by broad-based demand. Growth in core markets picked up meaningfully. Net origin nights booked in the U.S., France, the UK, and Australia all accelerated, a reassuring data point after quarters where expansion markets were doing the heavy lifting. First-time booker growth hit 11%, the highest in four years, with Brazil, Japan, and India leading. That mix of core market reacceleration and expansion market momentum gives the top-line guidance some cushion.
Supply growth is also shifting. Hotel nights booked grew roughly three times as fast as the homes business, though from a single-digit base. Airbnb Experiences supply increased nearly 80% year-over-year. These are still small contributors to overall nights, but they are diversifying the platform beyond its core short-term rental identity. The hotel channel in particular is a deliberate strategy: approximately 35% of first-time hotel bookers return to book a home, making it an effective acquisition funnel.
The capital allocation story is harder to ignore. Airbnb repurchased $1.1 billion of stock in Q2, continuing an aggressive buyback pace that has reduced the fully diluted share count by approximately 10% since Q3 2022. The company has $3.4 billion remaining on its authorization. At a $90 billion market cap, the buyback yield is meaningful, but the pace raises a question the company does not address directly: whether returning capital at this velocity is optimal given the investment opportunities in AI, Experiences, and international expansion. Management's stated capital allocation priority is organic growth first, then strategic acquisitions, then shareholder returns. The buyback pace suggests either that the organic opportunity set is not large enough to absorb the cash flow, or that management sees the stock as undervalued. Either interpretation has implications for the growth trajectory.
Free cash flow was $1.3 billion in Q2, a 30% year-over-year increase, with a 35% FCF margin. Trailing twelve-month FCF reached $4.8 billion, a 37% margin. The cash generation is exceptional, but the growth in funds held on behalf of customers to $12.2 billion and the expansion of Reserve Now, Pay Later are shifting the timing of cash flows. Unearned fees were flat year-over-year at $2.8 billion, which management attributed to the deferral of guest payments closer to the stay date. That dynamic will continue to create noise in quarterly FCF comparisons.
Q3 guidance calls for revenue of $4.69 billion to $4.77 billion, representing 15% to 17% growth, with an approximate three percentage point FX tailwind. Adjusted EBITDA margin is expected to be down slightly year-over-year due to investment timing. The full-year margin raise to at least 35.5% implies confidence that the Q3 dip is temporary and that the operating leverage from AI and scale will reassert itself in Q4.
What to watch next is whether the AI-driven support cost improvements continue at the current pace and whether the hotel and Experiences verticals can become material enough to move the overall growth rate. The core business is performing well, but the multiple already reflects that. The next leg of the story depends on whether Airbnb can sustain margin expansion while investing in new categories, or whether the buyback pace signals that management sees diminishing returns on those investments.