Senior officials from Turkey and Israel have been meeting in Geneva to try to settle the diplomatic dispute caused by the killing of Turkish citizens in an Israeli raid on an aid flotilla in May.
The talks follow Turkey's decision last week to send two aircraft to help its long-time ally fight a forest fire.
Nine people were killed on the Turkish ship, Mavi Marmara, as it tried to breach Israel's blockade of Gaza.
Turkey has so far demanded that Israel apologise and offer compensation.
Israel has admitted mistakes were made in intelligence-gathering and planning, but insisted its commandos used lethal force on boarding the Mavi Marmara because pro-Palestinian activists had attacked them.
The activists have said the troops opened fire as soon as they boarded the vessel, which was in international waters at the time.
A blockade has been imposed on the Gaza Strip by Israel and Egypt since the Islamist militant group, Hamas, seized control in 2007.
The BBC's Jonathan Head in Istanbul says that, six months after the raid on the Mavi Marmara, the meeting in Geneva was the first real effort to end the diplomatic rift between the two countries.
The two senior officials are reported to have explored a compromise formula which bridges Turkey's demand for an apology and compensation, and Israel's insistence that its forces were justified in using force when they boarded the flotilla, our correspondent says.