Often associated? the only reference I can think of to a fiery chariot is this one:
NKJV 2Ki 2:11 Then it happened, as they continued on and talked, that suddenly a chariot of fire appeared with horses of fire, and separated the two of them; and Elijah went up by a whirlwind into heaven.
I have never hears of UFOs being pulled along by horses.
As for "other aerial phenomena", we have Jacob's ladder, with angels ascending and descending. That doesn't sound like a UFO or an alien. I would also add that a lot of what are assumed to be aerial phenomena involving angels are not. Take the angels who appeared to the shepherds when Jesus was born. So many Christmas cards show a throng of angels up in the sky, but what does the Bible actually say?
NKJV Luk 2:8 Now there were in the same country shepherds living out in the fields, keeping watch over their flock by night.
Luk 2:9 And behold, an angel of the Lord stood before them, and the glory of the Lord shone around them, and they were greatly afraid.
Luk 2:10 Then the angel said to them, "Do not be afraid, for behold, I bring you good tidings of great joy which will be to all people.
Luk 2:11 For there is born to you this day in the city of David a Savior, who is Christ the Lord.
Luk 2:12 And this will be the sign to you: You will find a Babe wrapped in swaddling cloths, lying in a manger."
Luk 2:13 And suddenly there was with the angel a multitude of the heavenly host praising God and saying:
Luk 2:14 "Glory to God in the highest, And on earth peace, goodwill toward men!"
Yes, the angel stood before them. He was not flying around in the air. Verse 13 says that a multitude of the heavenly host joined the first angel, and again, not one hint that they were flying in the air.