I like to try to fly in different types of planes. I guess I tend to like the planes Boeing makes. I've flown in all their newer, more common planes (737,747,757,767,777,787) but not the other ones.

This October I have a flight on a 717 (my first one) which leaves 707 and 727 to complete the 7X7 series.

It appears those last two planes are barely still around.

Is there any practical way to fly commercially on a 707 or 727?