My band is going to Germany for two weeks in January, and need some advice about travelling overseas with my basses. I've flown as far as the west coast before only loosening the string tension, but this ride is going to be LONG! Do I need to do anything else? I was mainly concerned with the temperature & humidity factors, if any. Do I need any kind of humidifier/de-humidifier? I'm pretty sure it will be in a non-climate controlled cargo hold for 8 hours or more, and didn't know if there were any concerns about temperature &/or condensation. My cases are Anvil-style ATA (not the SKB plastic type), but I'm not sure if they are (or need to be) 100% airtight. Thanks!