International Olympic Committee (IOC) members voted on Tuesday to amend the Olympic charter and allow for the host cities of the 2024 and 2028 Summer Games to be determined simultaneously.

The proposal, agreed to during a show-of-hands vote in Lausanne, Switzerland, effectively guarantees Paris and Los Angeles will each host another Olympics, although it is yet to be decided which city will stage the first of the two events that follow the 2020 Games in Japan.

That decision should be finalized at an IOC meeting in Lima, Peru, on September 13. In the meantime, the IOC's executive board is charged with bringing all parties to an agreement on hosting rights.

While both cities' bid committees have insisted throughout the process that hosting in 2024 is their top priority, Los Angeles has shown more willingness in its public statements than Paris to accept the 2028 event.

There is still a chance the parties could fail to come to an agreement and IOC members would vote only on the 2024 host in September, as scheduled, but given the months of work IOC president Thomas Bach and other officials have put into the 2024/2028 scheme, that outcome seems unlikely.