Incredible Facts About the B-2 Spirit 23. Maintenance costs run around $3.4 million per month for each aircraft. A large reason is because the “low-observable” skins require fully air-conditioned hangars that are also large enough to fit its 172 foot wingspan. Pages: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50