First check

PlaneBooking/.classpath

+<?xml version="1.0" encoding="UTF-8"?>
+<classpath>
+	<classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/JavaSE-12">
+		<attributes>
+			<attribute name="module" value="true"/>
+		</attributes>
+	</classpathentry>
+	<classpathentry kind="src" path="src"/>
+	<classpathentry kind="output" path="bin"/>
+</classpath>

PlaneBooking/.gitignore

+/bin/

PlaneBooking/.project

+<?xml version="1.0" encoding="UTF-8"?>
+<projectDescription>
+	<name>PlaneBooking</name>
+	<comment></comment>
+	<projects>
+	</projects>
+	<buildSpec>
+		<buildCommand>
+			<name>org.eclipse.jdt.core.javabuilder</name>
+			<arguments>
+			</arguments>
+		</buildCommand>
+	</buildSpec>
+	<natures>
+		<nature>org.eclipse.jdt.core.javanature</nature>
+	</natures>
+</projectDescription>

PlaneBooking/.settings/org.eclipse.jdt.core.prefs

+eclipse.preferences.version=1
+org.eclipse.jdt.core.compiler.codegen.inlineJsrBytecode=enabled
+org.eclipse.jdt.core.compiler.codegen.targetPlatform=12
+org.eclipse.jdt.core.compiler.codegen.unusedLocal=preserve
+org.eclipse.jdt.core.compiler.compliance=12
+org.eclipse.jdt.core.compiler.debug.lineNumber=generate
+org.eclipse.jdt.core.compiler.debug.localVariable=generate
+org.eclipse.jdt.core.compiler.debug.sourceFile=generate
+org.eclipse.jdt.core.compiler.problem.assertIdentifier=error
+org.eclipse.jdt.core.compiler.problem.enablePreviewFeatures=disabled
+org.eclipse.jdt.core.compiler.problem.enumIdentifier=error
+org.eclipse.jdt.core.compiler.problem.reportPreviewFeatures=warning
+org.eclipse.jdt.core.compiler.release=enabled
+org.eclipse.jdt.core.compiler.source=12

PlaneBooking/src/Book.java

+import java.util.Scanner;
+import java.util.Random;
+import java.util.Arrays;
+
+
+public class Book {
+	private char[][] Seat;
+	private boolean booked = false;
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		Scanner input = new Scanner(System.in);
+		Scanner inputstring = new Scanner(System.in);
+		
+		Seat = new char[10][9];
+		 
+		printSeat();
+		
+		System.out.println("Enter name: ");
+		String name = input.next();
+		
+		System.out.println("Enter Origin City: ");
+		String city = input.next();
+		
+		System.out.println("Enter Destination: ");
+		String dest = input.next();
+		//generate flight number
+		Random rando = new Random();
+		
+		int Flightnum = rando.nextInt(27);
+		
+		Flightnum += 1;
+		
+		System.out.println("Your flight number is");
+		System.out.println("FL" + Flightnum);
+		
+		//Array
+		String[][] seat = new String[9][10];
+		booked = "XX";
+		
+		
+		//Visual Menu
+		System.out.println("Choose what class you would like");
+		System.out.println("1\t First Class");
+		System.out.println("2\t Business Class");
+		System.out.println("3\t Economy Class");
+		
+		System.out.println("Your choice:");
+		//input
+		int choice = input.nextInt();
+		
+			
+		if(choice == 1) {
+			System.out.println("You will get a seat between 1-18");
+		}
+		else if(choice == 2) {
+			System.out.println("You will get a seat between 19-45");
+		}
+		else
+		{
+			System.out.println("You will get a seat between 46-90");
+		}
+		
+		
+		
+		
+		System.out.println("Would you like to choose your seat? ");
+		String choice1 = inputstring.nextLine();
+		
+		if(choice1 == "yes") {
+			
+		}
+		
+		
+		
+
+	}
+
+}