Final answer:
The specific code for a pilot who missed a connection and calls in for a pairing would depend on the airline's internal procedures but may typically be referred to as 'MISCONN' for Missed Connection.
Step-by-step explanation:
If a pilot calls at 1200 for his 1450 pairing because he missed his connection, the specific code used can vary depending on the airline's operational codes and procedures. However, in the aviation industry, most airlines use standard codes provided by organizations such as the International Air Transport Association (IATA) or their internal codes for flight crew scheduling events.
For a missed connection, a common term that might be used is 'MISCONN' (Missed Connection), but this can differ. It is important for pilots and crew to be familiar with their airline's specific operational codes and procedures. Upon missing a connection, the pilot should report to crew scheduling and use the appropriate code designated by their airline to communicate the situation. This will likely lead to the reassignment of the pilot to an alternate pairing or required next steps according to the airline's policies.