Shalom, "Son of Man."
Yes, that's true! But, God expects you to use your head about this, too! Open up the context of Matthew 24:
Matthew 24:23-31
23 Then if any man shall say unto you, Lo, here is Christ, or there; believe it not.
24 For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
25 Behold, I have told you before.
26 Wherefore if they shall say unto you, Behold, he is in the desert; go not forth: behold, he is in the secret chambers; believe it not.
27 For as the lightning cometh out of the east, and shineth even unto the west; so shall also the coming of the Son of man be.
28 For wheresoever the carcase is, there will the eagles be gathered together.
29 Immediately after the tribulation of those days shall the sun be darkened, and the moon shall not give her light, and the stars shall fall from heaven, and the powers of the heavens shall be shaken:
30 And then shall appear the sign of the Son of man in heaven: and then shall all the tribes of the earth mourn, and they shall see the Son of man coming in the clouds of heaven with power and great glory.
31 And he shall send his angels with a great sound of a trumpet, and they shall gather together his elect from the four winds, from one end of heaven to the other.
KJV
What Yeshua` was saying is this: 'If any man says to you, "Look! Here's the Messiah!" or "There He is!" Don't you believe it! There shall arise pseudo-messiahs and pseudo-prophets, and they'll show great miracles and awesome deeds; so much so that, if it was possible, they should fool even the chosen ones! Pay attention! I've told you this beforehand! So, if they shall say to you, "Look! He's out in the desert!" DON'T GO OUT THERE! "Look! He's in the storage rooms!" DON'T YOU BELIEVE IT! For as lightning flashes in the east and shines to the west, THAT'S how the coming of the Son of Man will be! "Wherever the meat is, that's where the vultures will flock!" (I.e., and YOU'RE the meat!) Immediately after the pressure of those days, the sun shall be darkened, the moon shall not reflect its light, and the stars (meteorites) shall fall from the sky and the weather of the skies shall be disrupted! Then the miracle of the Son of Man shall appear in the sky, and then all families of the Land shall mourn, and they shall see the Son of Man coming in the clouds of the sky with power and intense brightness! He shall send out His messengers with the loud blare of a trumpet (shofar), and they shall collect His chosen ones from the four compass directions, from the lowest point of the sky to the highest point of the sky!'
What you SHOULD be comparing between Matthew 24 and 1 Corinthians 15 is not the "lightning" of Matthew 24:27 to the "twinkling of an eye" of 1 Corinthians 15:52, but rather "the loud blare of a trumpet" of Matthew 24:29-31 to "the trumpet shall blare" of 1 Corinthians 15:51-54, adding to this the additional information of "look up, and lift up your heads; for your redemption draweth nigh" of Luke 21:28 to "the dead shall be raised incorruptible, and we shall be changed. For this corruptible must put on incorruption, and this mortal must put on immortality. So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory" of 1 Corinthians 15:52-54:
Luke 21:25-28
25 And there shall be signs in the sun, and in the moon, and in the stars; and upon the earth distress of nations, with perplexity; the sea and the waves roaring;
26 Men's hearts failing them for fear, and for looking after those things which are coming on the earth: for the powers of heaven shall be shaken.
27 And then shall they see the Son of man coming in a cloud with power and great glory.
28 And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh.
KJV
1 Corinthians 15:51-54
51 Behold, I shew you a mystery; We shall not all sleep, but we shall all be changed,
52 In a moment, in the twinkling of an eye, at the last trump: for the trumpet shall sound, and the dead shall be raised incorruptible, and we shall be changed.
53 For this corruptible must put on incorruption, and this mortal must put on immortality.
54 So when this corruptible shall have put on incorruption, and this mortal shall have put on immortality, then shall be brought to pass the saying that is written, Death is swallowed up in victory.
KJV
Paul was saying, 'Look, I'll tell you a secret: We're not all going to "sleep" (i.e. in death), but we shall all be transformed in an instant, in the twinkle of an eye, at the last trumpeting: The trumpet (shofar) shall blare, and the dead (believers) shall be raised indestructible, and we shall be transformed, because this decayable (body) must put on indestructibility, and this mortal (body) must put on immortality. And, when this decayable (body) shall have put on indestructibility, and this mortal (body) shall have put on immortality, then the saying that was written, "Death is swallowed up in victory," shall be fulfilled!'
That IS the redemption (the "buying-back") of our bodies!