And NASA is also being called on to develop new technologies to solve problems involved in long-term space flight for humans and robots.

VOA: special.2010.04.28

Despite billions being spent on aviation security since 911, security was breached on Christmas Day as the trans-Atlantic flight from Amsterdam approached Detroit.

VOA: standard.2009.12.28

Also,the effectiveness of such watch lists is being called into question, as the man charged with trying to bring down flight 253 on Christmas Day was not on the U.S.'no fly' list.

VOA: standard.2009.12.28

The most recent threat nearly got away. The 30-year-old Pakistani American was on board this flight, bound for Dubai when pilots heard this from Air Traffic Control: Federal agents stopped the flight and removed Shahzad, who managed to board the airplane despite being placed on a "no-fly" list hours before.

VOA: standard.2010.05.06