Under most circumstances, we do not take ownership of the products and services being sold. Instead, we act as an agent in substantially all of our transactions. Our risk of loss due to obligations for canceled hotel and airline ticket reservations is thus relatively remote. Accordingly, we recognize revenues primarily based on commissions earned rather than transaction value.
Since current PRC laws and regulations impose certain restrictions on foreign ownership of travel agency and value-added telecommunications businesses in China, we conduct part of our transportation ticketing and packaged-tour businesses through the VIEs. Historically, we generated a portion of our revenues from fees charged to these entities. See “Item 7. Major Shareholders and Related Party Transactions—B. Related Party Transactions—Arrangements with the VIEs” in our 2023 Annual Report for a description of our relationship with these entities.
Accommodation Reservation. In 2021, 2022, and 2023, our accommodation reservation revenue was RMB8.1 billion, RMB7.4 billion, and RMB17.3 billion (US$2.4 billion), representing 41%, 37%, and 39% of our total revenues, respectively. For the three months ended March 31, 2023 and 2024, our accommodation reservation revenue was RMB3.5 billion and RMB4.5 billion (US$623 million), representing 38% and 38% of our total revenues, respectively.
We generate substantially all of our accommodation reservation revenue through commissions from hotel reservation partners through our platform. We recognize revenues when the reservation becomes non-cancelable, which is the point at which we complete our performance obligation in accommodation reservation services. Contracts with certain hotel reservation partners contain incentive commissions that are typically subject to specific performance targets. We generally receive incentive commissions from hotels through monthly arrangements based on performance targets of accommodation reservations where our users have completed their stay.
Transportation Ticketing. In 2021, 2022, and 2023, our transportation ticketing revenue was RMB6.9 billion, RMB8.3 billion, and RMB18.4 billion (US$2.6 billion), representing 34%, 41%, and 41% of our total revenues, respectively. For the three months ended March 31, 2023 and 2024, our transportation ticketing revenue was RMB4.2 billion and RMB5.0 billion (US$692 million), representing 45% and 42% of our total revenues, respectively.
We operate our transportation ticketing business primarily through our wholly-owned subsidiaries, the VIEs, and a network of ecosystem partners. Commissions from transportation ticketing rendered are recognized after tickets are issued as this is when our performance obligation is satisfied.
Packaged tours. In 2021, 2022, and 2023, our packaged tours revenue was RMB1.1 billion, RMB797 million, and RMB3.1 billion (US$442 million), respectively. For the three months ended March 31, 2023 and 2024, our packaged tours revenue was RMB386 million and RMB883 million (US$122 million), respectively. We bundle the packaged-tour products and services and receive referral fees from ecosystem partners for packaged-tour products and services through our platform. Referral fees are recognized on the departure date of the packaged tours as this is when our performance obligation is satisfied.
Corporate Travel. Our corporate travel revenue primarily includes commissions from transportation ticket booking, accommodation reservation, and packaged-tour services rendered to corporate clients. In 2021, 2022, and 2023, revenue from our corporate travel services was RMB1.3 billion, RMB1.1 billion, and RMB2.3 billion (US$317 million), respectively. For the three months ended March 31, 2023 and 2024, revenue from our corporate travel services was RMB445 million and RMB511 million (US$71 million), respectively. We contract with corporate clients based on a service fee model. Travel reservations are made via online and offline services for transportation ticket booking, accommodation reservation, and packaged-tour services. Corporate travel revenue is recognized on a net basis after the services are rendered and collections are reasonably assured.
Other Businesses. Our other businesses primarily consist of online advertising services and financial services. In 2021, 2022, and 2023, revenue from other business was RMB2.5 billion, RMB2.5 billion, and RMB3.5 billion (US$488 million), respectively. For the three months ended March 31, 2023 and 2024, revenue from other business was RMB744 million and RMB1,031 million (US$143 million), respectively. Advertising revenue is recognized ratably over the fixed term of the agreement as services are provided or upon relevant performance obligations being fulfilled through the display of the advertisements. The financial service revenue mainly represents the platform service fees from third-party financial institutions that are recognized ratably over the service period as well as the interest income from the receivables due from the users that are recognized over the credit period.
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