How High Planes Fly. Planes equipped with jet engines fly at greater altitudes than propeller-driven aircraft. These include commercial flights, cargo jets and even private passenger jets. The air traffic control tower usually assigns a cruising altitude of up to 39,000 feet, but long flights are typically assigned higher altitudes. By keeping these planes at assigned altitudes, air traffic control creates invisible stacked highways in the sky, keeping enough air space between the flights.
Blockage to or damage in the fallopian tube is one of the causes of infertility. Fallopian tubes play an important role in ovulation, as well as conception. Once the female egg is released from the ovary, one of the fallopian tubes (i.e. the fimbriae) picks up the egg and pushes it to pass through the tube.
Causes of blocked fallopian tubes. The most common cause of blocked fallopian tubes is  inflammatory infection, including pelvic inflammatory disease (PID), STDs and endometriosis. These infections cause scar tissue and adhesions to build up on the walls and thereby block the fallopian tubes. Other potential causes of blocked fallopian tubes include: History of uterine infection caused by an abortion or miscarriage; History of abdominal surgery; Previous ectopic pregnancy; Prior surgery involving the fallopian tubes such as a tubal ligation (âgetting your tubes tiedâ) or tubal ligation reversal. Symptoms of blocked fallopian tubes. Most instances of blocked ...