in the aircraft to prevent interfer- ence," says Ken Jochim, vice president of engineering and operations for the Louisville, Colorado-based company. The company notes that rigorous testing will be required to satisfy concerns relating to possible interference with the aircraft's communication and navi- gation systems. AirCell says it has entered into discussions with the FCC and FAA to ensure all requirements are properly met. SPEECH INTEGRATION Although airlines are reluctant to admit the fact, an unknown percentage of passengers actually do use their mobile phones-albeit stealthily-while flying. "Many passengers use their Blackberry devices on planes as well," says Edward Rerisi, an analyst at research firm ABI. "These technologies work, but coverage is often spotty and the exact effects on the aircraft's communications are still unproven." Flying phone users can also wreck havoc on terrestrial base stations. "When airborne, a single mobile handset may be able to transmit to multiple base stations," says Rerisi. "This poses a particularly challenging problem with CDMA networks, but reportedly less SO with TDMA, GSM and analog networks." Although AirCell's technology addresses the technical challenges posed by airborne mobile phone use, the company has yet to unveil the system's busi- ness model. "Billing will be a challenge," predicts Rerisi. "What about pricing plans? Surely the airlines will want to share in the revenues garnered during in-flight calls." AirCell states that it is working toward getting its technology certified for commercial air transport aircraft and that discussions are in process with several airlines to finalize plans for a trial program. Rerisi describes AirCell's system as a "plausible" technology, although "regulatory and business chal- lenges may prevent the technology from leaving the ground." 1.10 SPEECH INTEGRATION Speech integration is the technology that adds voice services to enterprise phone systems and Web sites. The speech recognition market has suffered along with the entir