There is very little need for GSA exclusive contracts with airline companies that charge the government extraordinary amount for the same flight. Government workers can book their own flights online for hundreds, even thousands less. For example, flights from DAY to DCA are about $1300 while it can be found on Kayak or Expedia for less than $300.
Most travel are not cancelled, cancellation fees should be deductible for validated mission changes. In the long run this will save the goverment millions of dollars.