This morning, we issued an earnings press release, which is available on our website at investors.sabre.com. More information on these risks and uncertainties is contained in our earnings release issued this morning and our SEC filings, including our Form 10-K for the year ended December 31, 2025. References during today's call to Adjusted EBITDA, Adjusted EBITDA margin, normalized Adjusted EBITDA, and normalized Adjusted EBITDA margin have been adjusted to exclude certain items. The most directly comparable GAAP measures and reconciliations for non-GAAP measures are available in the earnings release and other documents posted on our website at investors.sabre.com.
Despite these challenges, we remained focused on execution and met or exceeded our financial guidance in the fourth quarter and ended the year with positive momentum. Sean Williams is appointed Chief Operating Officer and will lead Sabre's revenue and commercial operations functions. On today's call, I've invited Garry to share our progress on delivering agentic AI solutions to drive long-term growth and why that makes us a critical part of the evolving AI ecosystem. For the year, we recorded double-digit year-on-year growth in normalized Adjusted EBITDA and generated positive pro forma free cash flow.
Sabre Payments was one of our fastest-growing businesses in 2025, with gross spend on the platform increasing more than 35% year-on-year and producing strong revenue growth. In the fourth quarter, air distribution bookings grew 4%, which included the direct and indirect impacts from the US government shutdown, and we ended the year with air bookings growth of 7% in December. Total distribution bookings grew 1% year-on-year, and full year air distribution bookings were also positive. Hotel distribution bookings increased 5% year-on-year to 42 million, and the attachment rate to air bookings increased over 130 basis points year-on-year.