'Mid heaven' in the Bible

I saw, and I heard an eagle, flying in mid heaven, saying with a loud voice, "Woe. Woe. Woe for those who dwell on the earth, because of the other voices of the trumpets of the three angels, who are yet to sound."

I saw another angel flying in mid heaven, having an eternal Good News to proclaim to those who dwell on the earth, and to every nation, tribe, language, and people.