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 an Ectopic Pregnancy. A damaged fallopian tube may not allow the fertilized egg to pass to the uterus. This can cause the egg to implant in the fallopian tube or somewhere else. You might not ever know what caused an ectopic pregnancy. But these factors increase your risk: 1  Use of an intrauterine device (IUD), a form of birth control, at the time of conception. 2  History of pelvic inflammatory disease (PID). 3  Sexually transmitted diseases such as chlamydia and gonorrhea.