TELECOMMUNICATIONS SYSTEMS: THIS IS IN REPLY TO YOUR LETTER OF NOVEMBER 11. YOUR TRAVEL WAS SCHEDULED ABOARD A U. CONNECTING WITH A FOREIGN AIR CARRIER TO AND FROM GENEVA SINCE THERE ARE NO U. BECAUSE OF A SCHEDULING CHANGE WHICH OCCURRED WHILE YOU WERE IN GENEVA. YOU ARE A GOVERNMENT CONTRACTOR REQUIRED BY YOUR CONTRACT TO USE U. S. AIR CARRIERS IN YOUR AIR TRAVEL WHEN THEY ARE "AVAILABLE. " AS T...