The invention claimed is:1. A device, comprising:one or more memories; andcontrol circuitry coupled to the one or more memories, wherein the control circuitry, in operation:monitors motion data;detects a runway travel state of the device based on the monitored motion data and an acceleration profile; andresponds to detection of the runway travel state of the device by monitoring motion data and pressure data to detect a transition from the runway travel state to a second travel state of the device; andresponds to detection of the transition to the second travel state of the device by generating one or more control signals to cause the device to enter a first travel mode of operation, wherein the second travel state is an airplane takeoff state and the first travel mode of operation is an airplane mode of operation.2. The device of claim 1 wherein the control circuitry, in operation, determines an energy of acceleration based on the monitored motion data and detects a travel state of the device based on the determined energy of acceleration and the acceleration profile.3. The device of claim 1 wherein the control circuitry, in operation:monitors temperature data;determines whether the temperature data indicates a temperature of the device is within a threshold temperature range; anddetects the runway state of the device based on the monitored motion data, the acceleration profile and the determination of whether the temperature data indicates the temperature of the device is within the threshold temperature range.4. The device of claim 1 wherein the control circuitry, in operation, employs a motion activation detection algorithm to detect travel states of the device.5. The device of claim 4 wherein the control circuitry, in operation, employs the motion activation detection algorithm to detect the transition from the runway travel state to the second travel state of the device.6. The device of claim 1 wherein the control circuitry, in operation:monitors the motion data to detect significant human motion inconsistent with the runway travel state; andresponds to detection of significant human motion inconsistent with the runway travel state by determining the device is not in the runway travel state.7. The device of claim 1 wherein the control circuitry, in operation:responds to detection of the transition to the second travel state by monitoring motion data and pressure data to detect a transition from the second travel state to a third travel state; andresponds to detection of the transition to the third travel state by generating one or more control signals to cause the device to enter a second travel mode of operation.8. The device of claim 1 wherein the control circuitry, in operation:responds to detection of the runway travel state by monitoring motion data, temperature data and pressure data; andresponds to monitored data inconsistent with the runway travel state by determining the runway travel state is not detected.9. The device of claim 1 wherein the control circuitry, in operation, employs one or more thresholds values and one or more threshold periods of time to detect a travel state of the device.10. The device of claim 1 wherein the motion data includes acceleration data and the acceleration profile is based on the acceleration data.11. The device of claim 10 wherein the acceleration profile has four distinct patterns.12. A system, comprising:a motion sensor;a pressure sensor;a memory; andcontrol circuitry coupled to the pressure sensor, the motion sensor, and the memory, wherein the control circuitry, in operation:monitors motion data generated by the motion sensor;detects a runway travel state based on the monitored motion data and an acceleration profile;responds to detection of the runway travel state by monitoring motion data generated by the motion sensor and pressure data generated by the pressure sensor to detect a transition from the runway travel state to a second travel state; andresponds to detection of the transition to the second travel state by generating one or more control signals to cause the system to enter a first travel mode of operation, wherein the second travel state is an airplane takeoff state and the first travel mode of operation is an airplane mode of operation.13. The system of claim 12 wherein the control circuitry, in operation, determines an energy of acceleration based on the motion data and detects travel states based on the determined energy of acceleration.14. The system of claim 12 wherein the control circuitry, in operation:monitors the motion data to detect significant human motion inconsistent with a determined travel state; andresponds to detection of significant human motion inconsistent with the determined travel state by determining the determined travel state is not detected.15. The system of claim 12 wherein the control circuitry includes an artificial neural network.16. The system of claim 12 wherein the motion sensor comprises a gyroscope.17. The system of claim 12 comprising at least a selected one of:an acoustic sensor;an altimeter; oran image sensor.18. A method, comprising:monitoring motion data to detect a runway travel state of a device using an acceleration profile;responding to detection of the runway travel state of the device by monitoring motion data and pressure data to detect a transition from the runway travel state to a second travel state of the device; andresponding to detection of the transition to the second travel state of the device by generating one or more control signals to cause the device to enter a first travel mode of operation, wherein the second travel state is an airplane takeoff state and the first travel mode of operation is an airplane mode of operation.19. The method of claim 18, comprising storing travel state detection determinations in a buffer.20. A non-transitory computer-readable medium having contents which cause control circuitry to perform a method, the method comprising:monitoring motion data to detect a runway travel state of a device;responding to detection of the runway travel state of the device by monitoring motion data and pressure data to detect a transition from the runway travel state to a second travel state of the device; andresponding to detection of the transition to the second travel state of the device by generating one or more control signals to cause the device to enter a first travel mode of operation, wherein the second travel state is an airplane takeoff state and the first travel mode of operation is an airplane mode of operation.21. The non-transitory computer-readable medium of claim 20 wherein the contents comprise instructions executed by the control circuitry.22. The device of claim 1 wherein the device comprises a handheld device.23. The device of claim 22 wherein the handheld device comprises a selected one of:a mobile phone;a tablet; ora laptop.