Allan Guttmacher Institute reported a 9% method failure rate for the Pill. Would you fly on a plane with a 9% chance of ceasing?
Crashing, bashing, $ma$hing
In the instances I know of, the pill failed when those taking it were also taking antibiotics. Those two are sisters, and both became pregnant while on the pill, so the antibiotics somehow suppressed the effects of the pill, an effect which may be confined to genetic lines, or not.
No method is 100%, not even surgical intervention (vasectomy or tubal ligation), because the procedures are not always done correctly.
Until the TSA quits groping the passengers, I have no intention of flying anywhere, and I'll leave making babies to the (older) grandkids.