Google believes it is on course to have enough internet-beaming balloons in the stratosphere to form a ring over part of the world next year.
The move would let it trial a continuous data service to people living below the balloons’ path.
The declaration coincides with the announcement that three of Indonesia’s mobile networks intend to start testing Project Loon’s transmissions next year.
One expert said the plan had benefits over other solutions.
Sri Lanka previously signed a separate agreement signalling its wish to be another participant in the giant helium balloon-based scheme.
Google first revealed its superpressure balloon plan in June 2013, when about 30 of the inflatable plastic “envelopes” were launched from New Zealand.