The letter was written in 1994 after the DOT approved extending the BA and USAir alliance. That alliance, remember, was vehemently opposed by American, United Airlines and Delta Air Lines before each one followed suit with their own broad codesharing alliances. 'As you know,' the letter reads, 'we are very disappointed by the US government's recent decision to approve the extension of the British Airways-USAir codesharing agreement, which gives British Airways tremendous competitive advantages versus US carriers. The attached book highlights the fervent support which the British government has long provided for British Airways, records the almost complete domination of British commercial aviation by British Air-ways, and at several points underscores the financial importance which British Airways attaches to preventing competition at Heathrow and on its routes beyond Heathrow.'