Strong's Concordance G3321

Rev 8:13  And I beheld, and heard an angel flying through the midst of heavenG3321, saying with a loud voice, Woe, woe, woe, to the inhabiters of the earth by reason of the other voices of the trumpet of the three angels, which are yet to sound!

Rev 14:6  And I saw another angel fly in the midst of heavenG3321, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,

Rev 19:17  And I saw an angel standing in the sun; and he cried with a loud voice, saying to all the fowls that fly in the midst of heavenG3321, Come and gather yourselves together unto the supper of the great God;