I haven't been able to take a loan worth more than 200k (with no securities) during the whole game. At best I've had company value of 3,8M, credit rating B, 900+ k/week income and CI about 30. I've been offered a loan with full securities for 25M, but only 200k with no securities. And all this while other companies have taken out huge loans and got new planes.
So, is there something I am doing wrong, or is there something wrong with the system?