Found this on their website. My only concern would be that ONE flight a day on Charter airline. Someone with TA experience can probably tell you more than I can, but it is my understanding that Charter airlines don't have the same passenger rights so if the one flight was cancelled they don't really have to try and put you on another carrier to get you there.
FROM THE TRANSMERIDIAN WEB SITE.
TransMeridian Airlines is a leading U.S. charter airline, operating under U.S. Department of Transportation FAR Part 121. The company, based in Atlanta, Georgia was founded in 1995. TransMeridian has traditionally flown on behalf of the nations largest tour operators from the upper Midwest and Northeast to points in the Caribbean and Mexico. TransMeridian is regulated by the FAA and meets the same exact maintenance and safety standards as any Major U.S. airline. The difference between TransMeridian and these larger airlines is how we sell to the public. Under Department of Transportation regulations, charter airlines like TransMeridian must escrow each passengers funds paid in advance of travel into a federally approved escrow account until that passenger has traveled. This provides for maximum consumer protection.
TransMeridians current fleet consists of five (5) Boeing 727-200 Advanced aircraft and four (4) Boeing 757-200ER aircraft and the current business plan includes the addition of a third type aircraft by year end. Since its founding TransMeridian has safely carried well over one million passengers to over 150 destinations primarily within the United States, Mexico, South America and the Caribbean.