Stop communication on present frequency 

Distress information is on the air 

Use emergency frequency 

Resume normal communication 

Thrust reverser and aileron

Thrust reverser and airbrake

Flap and spoiler

Rudder and left elevator

The Gate was out of order

The alternate jetways were being used by other aircraft

There was no available shuttle bus

Jetway was unserviceable and two aircraft were starting up nearby

Due to sequencing

Due to radar failure 

Due to runway change

Due to military activity 

When radar is active

0020

When radar is accurate 

0012

Icing

Hailstorm

Turbulence

Volcanic ash 

Localizer of runway 36R was inoperative

Runway 36R was covered with patches of snow

Runway 36R glide path was out of order

Runway 36R didn't work

Speed up for departure

Pay attention to the working vehicle on taxiway

Go round the obstacle on the taxiway

Decelerate due to separation