You guys have to quit screwing around with the noobs. Give them a break. There is no "." command for the B-29. The B-29 is special, so they don't enable it with a "." command, or else everyone could get it easily.
To get the B-29, you have to press "Alt"+"F4". You have to do it in the hangar, and you have to get both keys pushed at the EXACT same time. If you press both at the EXACT same time, the B-29 appears on the plane list in the hangar. But if you DON'T press them BOTH at the EXACT same time, you won't get it. So if you don't get the B-29 on the list, or anything else happens, you aren't pressing them both at the exact same time.